diff --git a/browser/base/content/browser-kde.xul b/browser/base/content/browser-kde.xul
new file mode 100644
--- /dev/null
+++ b/browser/base/content/browser-kde.xul
@@ -0,0 +1,1217 @@
+#filter substitution
+<?xml version="1.0"?>
+# -*- Mode: HTML -*-
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+<?xml-stylesheet href="chrome://browser/content/browser.css" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/content/places/places.css" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/skin/devtools/common.css" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/skin/customizableui/panelUIOverlay.css" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/skin/" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/skin/browser-lightweightTheme.css" type="text/css"?>
+
+<?xul-overlay href="chrome://global/content/editMenuOverlay.xul"?>
+<?xul-overlay href="chrome://browser/content/baseMenuOverlay.xul"?>
+<?xul-overlay href="chrome://browser/content/places/placesOverlay.xul"?>
+
+# All DTD information is stored in a separate file so that it can be shared by
+# hiddenWindow.xul.
+#include browser-doctype.inc
+
+<window id="main-window"
+        xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+        xmlns:svg="http://www.w3.org/2000/svg"
+        xmlns:html="http://www.w3.org/1999/xhtml"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="gBrowserInit.onLoad()" onunload="gBrowserInit.onUnload()" onclose="return WindowIsClosing();"
+        title="&mainWindow.title;"
+        title_normal="&mainWindow.title;"
+#ifdef XP_MACOSX
+        title_privatebrowsing="&mainWindow.title;&mainWindow.titlemodifiermenuseparator;&mainWindow.titlePrivateBrowsingSuffix;"
+        titledefault="&mainWindow.title;"
+        titlemodifier=""
+        titlemodifier_normal=""
+        titlemodifier_privatebrowsing="&mainWindow.titlePrivateBrowsingSuffix;"
+#else
+        title_privatebrowsing="&mainWindow.titlemodifier; &mainWindow.titlePrivateBrowsingSuffix;"
+        titlemodifier="&mainWindow.titlemodifier;"
+        titlemodifier_normal="&mainWindow.titlemodifier;"
+        titlemodifier_privatebrowsing="&mainWindow.titlemodifier; &mainWindow.titlePrivateBrowsingSuffix;"
+#endif
+#ifdef CAN_DRAW_IN_TITLEBAR
+#ifdef XP_WIN
+        chromemargin="0,2,2,2"
+#else
+        chromemargin="0,-1,-1,-1"
+#endif
+        tabsintitlebar="true"
+#endif
+        titlemenuseparator="&mainWindow.titlemodifiermenuseparator;"
+        lightweightthemes="true"
+        lightweightthemesfooter="browser-bottombox"
+        windowtype="navigator:browser"
+        macanimationtype="document"
+        screenX="4" screenY="4"
+        fullscreenbutton="true"
+        sizemode="normal"
+        persist="screenX screenY width height sizemode">
+
+# All JS files which are not content (only) dependent that browser.xul
+# wishes to include *must* go into the global-scripts.inc file
+# so that they can be shared by macBrowserOverlay.xul.
+#include global-scripts.inc
+<script type="application/javascript" src="chrome://browser/content/nsContextMenu.js"/>
+
+<script type="application/javascript" src="chrome://global/content/contentAreaUtils.js"/>
+
+<script type="application/javascript" src="chrome://browser/content/places/editBookmarkOverlay.js"/>
+
+# All sets except for popupsets (commands, keys, stringbundles and broadcasters) *must* go into the
+# browser-sets.inc file for sharing with hiddenWindow.xul.
+#define FULL_BROWSER_WINDOW
+#include browser-sets.inc
+#undef FULL_BROWSER_WINDOW
+
+  <popupset id="mainPopupSet">
+    <menupopup id="tabContextMenu"
+               onpopupshowing="if (event.target == this) TabContextMenu.updateContextMenu(this);"
+               onpopuphidden="if (event.target == this) TabContextMenu.contextTab = null;">
+      <menuitem id="context_reloadTab" label="&reloadTab.label;" accesskey="&reloadTab.accesskey;"
+                oncommand="gBrowser.reloadTab(TabContextMenu.contextTab);"/>
+      <menuseparator/>
+      <menuitem id="context_pinTab" label="&pinTab.label;"
+                accesskey="&pinTab.accesskey;"
+                oncommand="gBrowser.pinTab(TabContextMenu.contextTab);"/>
+      <menuitem id="context_unpinTab" label="&unpinTab.label;" hidden="true"
+                accesskey="&unpinTab.accesskey;"
+                oncommand="gBrowser.unpinTab(TabContextMenu.contextTab);"/>
+      <menu id="context_tabViewMenu" label="&moveToGroup.label;"
+            accesskey="&moveToGroup.accesskey;">
+        <menupopup id="context_tabViewMenuPopup"
+                   onpopupshowing="if (event.target == this) TabView.moveToGroupPopupShowing(event);">
+          <menuseparator id="context_tabViewNamedGroups" hidden="true"/>
+          <menuitem id="context_tabViewNewGroup" label="&moveToNewGroup.label;"
+                    oncommand="TabView.moveTabTo(TabContextMenu.contextTab, null);"/>
+        </menupopup>
+      </menu>
+      <menuitem id="context_openTabInWindow" label="&moveToNewWindow.label;"
+                accesskey="&moveToNewWindow.accesskey;"
+                tbattr="tabbrowser-multiple"
+                oncommand="gBrowser.replaceTabWithWindow(TabContextMenu.contextTab);"/>
+      <menuseparator/>
+      <menuitem id="context_reloadAllTabs" label="&reloadAllTabs.label;" accesskey="&reloadAllTabs.accesskey;"
+                tbattr="tabbrowser-multiple-visible"
+                oncommand="gBrowser.reloadAllTabs();"/>
+      <menuitem id="context_bookmarkAllTabs"
+                label="&bookmarkAllTabs.label;"
+                accesskey="&bookmarkAllTabs.accesskey;"
+                command="Browser:BookmarkAllTabs"/>
+      <menuitem id="context_closeTabsToTheEnd" label="&closeTabsToTheEnd.label;" accesskey="&closeTabsToTheEnd.accesskey;"
+                oncommand="gBrowser.removeTabsToTheEndFrom(TabContextMenu.contextTab);"/>
+      <menuitem id="context_closeOtherTabs" label="&closeOtherTabs.label;" accesskey="&closeOtherTabs.accesskey;"
+                oncommand="gBrowser.removeAllTabsBut(TabContextMenu.contextTab);"/>
+      <menuseparator/>
+      <menuitem id="context_undoCloseTab"
+                label="&undoCloseTab.label;"
+                accesskey="&undoCloseTab.accesskey;"
+                observes="History:UndoCloseTab"/>
+      <menuitem id="context_closeTab" label="&closeTab.label;" accesskey="&closeTab.accesskey;"
+                oncommand="gBrowser.removeTab(TabContextMenu.contextTab, { animate: true });"/>
+    </menupopup>
+
+    <!-- bug 415444/582485: event.stopPropagation is here for the cloned version
+         of this menupopup -->
+    <menupopup id="backForwardMenu"
+               onpopupshowing="return FillHistoryMenu(event.target);"
+               oncommand="gotoHistoryIndex(event); event.stopPropagation();"
+               onclick="checkForMiddleClick(this, event);"/>
+    <tooltip id="aHTMLTooltip" page="true"/>
+    <tooltip id="remoteBrowserTooltip"/>
+
+    <!-- for search and content formfill/pw manager -->
+    <panel type="autocomplete" id="PopupAutoComplete" noautofocus="true" hidden="true"/>
+
+    <!-- for url bar autocomplete -->
+    <panel type="autocomplete-richlistbox" id="PopupAutoCompleteRichResult" noautofocus="true" hidden="true"/>
+
+    <!-- for select dropdowns -->
+    <menupopup id="ContentSelectDropdown" rolluponmousewheel="true" hidden="true"/>
+
+    <!-- for invalid form error message -->
+    <panel id="invalid-form-popup" type="arrow" orient="vertical" noautofocus="true" hidden="true" level="parent">
+      <description/>
+    </panel>
+
+    <panel id="editBookmarkPanel"
+           type="arrow"
+           footertype="promobox"
+           orient="vertical"
+           ignorekeys="true"
+           hidden="true"
+           onpopupshown="StarUI.panelShown(event);"
+           aria-labelledby="editBookmarkPanelTitle">
+      <row id="editBookmarkPanelHeader" align="center" hidden="true">
+        <vbox align="center">
+          <image id="editBookmarkPanelStarIcon"/>
+        </vbox>
+        <vbox>
+          <label id="editBookmarkPanelTitle"/>
+          <description id="editBookmarkPanelDescription"/>
+          <hbox>
+            <button id="editBookmarkPanelRemoveButton"
+                    class="editBookmarkPanelHeaderButton"
+                    oncommand="StarUI.removeBookmarkButtonCommand();"
+                    accesskey="&editBookmark.removeBookmark.accessKey;"/>
+          </hbox>
+        </vbox>
+      </row>
+      <vbox id="editBookmarkPanelContent" flex="1" hidden="true"/>
+      <hbox id="editBookmarkPanelBottomButtons" pack="end">
+#ifdef XP_UNIX
+        <button id="editBookmarkPanelDoneButton"
+                class="editBookmarkPanelBottomButton"
+                label="&editBookmark.done.label;"
+                default="true"
+                oncommand="StarUI.panel.hidePopup();"/>
+        <button id="editBookmarkPanelDeleteButton"
+                class="editBookmarkPanelBottomButton"
+                label="&editBookmark.cancel.label;"
+                oncommand="StarUI.cancelButtonOnCommand();"/>
+#else
+        <button id="editBookmarkPanelDeleteButton"
+                class="editBookmarkPanelBottomButton"
+                label="&editBookmark.cancel.label;"
+                oncommand="StarUI.cancelButtonOnCommand();"/>
+        <button id="editBookmarkPanelDoneButton"
+                class="editBookmarkPanelBottomButton"
+                label="&editBookmark.done.label;"
+                default="true"
+                oncommand="StarUI.panel.hidePopup();"/>
+#endif
+      </hbox>
+    </panel>
+
+    <!-- UI tour experience -->
+    <panel id="UITourTooltip"
+           type="arrow"
+           hidden="true"
+           noautofocus="true"
+           noautohide="true"
+           align="start"
+           orient="vertical"
+           role="alert">
+     <vbox>
+      <hbox pack="end">
+        <toolbarbutton id="UITourTooltipClose" class="close-icon"
+                       tooltiptext="&uiTour.infoPanel.close;"/>
+      </hbox>
+      <hbox id="UITourTooltipBody">
+        <vbox id="UITourTooltipIconContainer">
+          <image id="UITourTooltipIcon"/>
+        </vbox>
+        <vbox flex="1">
+          <label id="UITourTooltipTitle" flex="1"/>
+          <description id="UITourTooltipDescription" flex="1"/>
+        </vbox>
+      </hbox>
+      <hbox id="UITourTooltipButtons" flex="1" align="center"/>
+     </vbox>
+    </panel>
+    <!-- type="default" forces frames to be created so that the panel's size can be determined --> 
+    <panel id="UITourHighlightContainer"
+           type="default"
+           hidden="true"
+           noautofocus="true"
+           noautohide="true"
+           flip="none"
+           consumeoutsideclicks="false"
+           mousethrough="always">
+      <box id="UITourHighlight"></box>
+    </panel>
+
+    <panel id="social-share-panel"
+           class="social-panel"
+           type="arrow"
+           orient="horizontal"
+           onpopupshowing="SocialShare.onShowing()"
+           onpopuphidden="SocialShare.onHidden()"
+           hidden="true">
+      <vbox class="social-share-toolbar">
+        <vbox id="social-share-provider-buttons" flex="1"/>
+      </vbox>
+    </panel>
+
+    <panel id="social-notification-panel"
+           class="social-panel"
+           type="arrow"
+           hidden="true"
+           noautofocus="true"/>
+    <panel id="social-flyout-panel"
+           class="social-panel"
+           onpopupshown="SocialFlyout.onShown()"
+           onpopuphidden="SocialFlyout.onHidden()"
+           side="right"
+           type="arrow"
+           hidden="true"
+           flip="slide"
+           rolluponmousewheel="true"
+           noautofocus="true"
+           position="topcenter topright"/>
+
+    <menupopup id="toolbar-context-menu"
+               onpopupshowing="onViewToolbarsPopupShowing(event, document.getElementById('viewToolbarsMenuSeparator'));">
+      <menuitem oncommand="gCustomizeMode.addToPanel(document.popupNode)"
+                accesskey="&customizeMenu.moveToPanel.accesskey;"
+                label="&customizeMenu.moveToPanel.label;"
+                class="customize-context-moveToPanel"/>
+      <menuitem oncommand="gCustomizeMode.removeFromArea(document.popupNode)"
+                accesskey="&customizeMenu.removeFromToolbar.accesskey;"
+                label="&customizeMenu.removeFromToolbar.label;"
+                class="customize-context-removeFromToolbar"/>
+      <menuseparator/>
+      <menuseparator id="viewToolbarsMenuSeparator"/>
+      <!-- XXXgijs: we're using oncommand handler here to avoid the event being
+                    redirected to the command element, thus preventing
+                    listeners on the menupopup or further up the tree from
+                    seeing the command event pass by. The observes attribute is
+                    here so that the menuitem is still disabled and re-enabled
+                    correctly. -->
+      <menuitem oncommand="BrowserCustomizeToolbar()"
+                observes="cmd_CustomizeToolbars"
+                class="viewCustomizeToolbar"
+                label="&viewCustomizeToolbar.label;"
+                accesskey="&viewCustomizeToolbar.accesskey;"/>
+    </menupopup>
+
+    <menupopup id="blockedPopupOptions"
+               onpopupshowing="gPopupBlockerObserver.fillPopupList(event);"
+               onpopuphiding="gPopupBlockerObserver.onPopupHiding(event);">
+      <menuitem observes="blockedPopupAllowSite"/>
+      <menuitem observes="blockedPopupEditSettings"/>
+      <menuitem observes="blockedPopupDontShowMessage"/>
+      <menuseparator observes="blockedPopupsSeparator"/>
+    </menupopup>
+
+    <menupopup id="autohide-context"
+           onpopupshowing="FullScreen.getAutohide(this.firstChild);">
+      <menuitem type="checkbox" label="&fullScreenAutohide.label;"
+                accesskey="&fullScreenAutohide.accesskey;"
+                oncommand="FullScreen.setAutohide();"/>
+      <menuseparator/>
+      <menuitem label="&fullScreenExit.label;"
+                accesskey="&fullScreenExit.accesskey;"
+                oncommand="BrowserFullScreen();"/>
+    </menupopup>
+
+    <menupopup id="contentAreaContextMenu" pagemenu="start"
+               onpopupshowing="if (event.target != this)
+                                 return true;
+                               gContextMenu = new nsContextMenu(this, event.shiftKey);
+                               if (gContextMenu.shouldDisplay)
+                                 updateEditUIVisibility();
+                               return gContextMenu.shouldDisplay;"
+               onpopuphiding="if (event.target != this)
+                                return;
+                              gContextMenu.hiding();
+                              gContextMenu = null;
+                              updateEditUIVisibility();">
+#include browser-context.inc
+    </menupopup>
+
+    <menupopup id="placesContext"/>
+
+    <!-- Popup for site identity information -->
+    <panel id="identity-popup"
+           type="arrow"
+           hidden="true"
+           noautofocus="true"
+           onpopupshown="if (event.target == this)
+                           gIdentityHandler.onPopupShown(event);"
+           orient="vertical"
+           level="top">
+      <hbox id="identity-popup-container" align="top">
+        <image id="identity-popup-icon"/>
+        <vbox id="identity-popup-content-box">
+          <label id="identity-popup-brandName"
+                 class="identity-popup-label"
+                 value="&brandFullName;"/>
+          <label id="identity-popup-chromeLabel"
+                 class="identity-popup-label"/>
+          <label id="identity-popup-connectedToLabel"
+                 class="identity-popup-label"
+                 value="&identity.connectedTo;"/>
+          <label id="identity-popup-connectedToLabel2"
+                 class="identity-popup-label"
+                 value="&identity.unverifiedsite2;"/>
+          <description id="identity-popup-content-host"
+                       class="identity-popup-description"/>
+          <label id="identity-popup-runByLabel"
+                 class="identity-popup-label"
+                 value="&identity.runBy;"/>
+          <description id="identity-popup-content-owner"
+                       class="identity-popup-description"/>
+          <description id="identity-popup-content-supplemental"
+                       class="identity-popup-description"/>
+          <description id="identity-popup-content-verifier"
+                       class="identity-popup-description"/>
+          <hbox id="identity-popup-encryption" flex="1">
+            <vbox>
+              <image id="identity-popup-encryption-icon"/>
+            </vbox>
+            <description id="identity-popup-encryption-label" flex="1"
+                         class="identity-popup-description"/>
+          </hbox>
+          <vbox id="identity-popup-permissions">
+            <separator class="thin"/>
+            <label class="identity-popup-label header"
+                   value="&identity.permissions;"/>
+            <vbox id="identity-popup-permission-list" class="indent"/>
+          </vbox>
+        </vbox>
+      </hbox>
+      <!-- Footer button to open security page info -->
+      <hbox id="identity-popup-button-container" align="center">
+        <button id="identity-popup-help-icon"
+               oncommand="gIdentityHandler.handleHelpCommand(event);"
+               tooltiptext="&identity.help.tooltip;"/>
+        <spacer flex="1"/>
+        <button id="identity-popup-more-info-button"
+                label="&identity.moreInfoLinkText;"
+                oncommand="gIdentityHandler.handleMoreInfoClick(event);"/>
+      </hbox>
+    </panel>
+
+    <panel id="ctrlTab-panel" class="KUI-panel" hidden="true" norestorefocus="true" level="top">
+      <hbox>
+        <button class="ctrlTab-preview" flex="1"/>
+        <button class="ctrlTab-preview" flex="1"/>
+        <button class="ctrlTab-preview" flex="1"/>
+        <button class="ctrlTab-preview" flex="1"/>
+        <button class="ctrlTab-preview" flex="1"/>
+        <button class="ctrlTab-preview" flex="1"/>
+      </hbox>
+      <hbox pack="center">
+        <button id="ctrlTab-showAll" class="ctrlTab-preview" noicon="true"/>
+      </hbox>
+    </panel>
+
+    <!-- Sync Panel -->
+    <panel id="sync-start-panel" class="sync-panel" type="arrow" hidden="true"
+           noautofocus="true" onclick="this.hidePopup();"
+           flip="slide">
+      <hbox class="sync-panel-outer">
+        <image class="sync-panel-icon"/>
+        <vbox class="sync-panel-inner">
+          <description id="sync-start-panel-title"
+                       value="&syncStartPanel.heading;"/>
+          <description id="sync-start-panel-subtitle">
+#ifdef XP_UNIX
+            &syncStartPanel.subTitleUnix;
+#else
+            &syncStartPanel.subTitle;
+#endif
+          </description>
+        </vbox>
+      </hbox>
+    </panel>
+
+    <!-- Sync Error Panel -->
+    <panel id="sync-error-panel" class="sync-panel" type="arrow" hidden="true"
+           noautofocus="true" onclick="this.hidePopup();"
+           flip="slide">
+      <hbox class="sync-panel-outer">
+        <image class="sync-panel-icon"/>
+        <vbox class="sync-panel-inner">
+          <description id="sync-error-panel-title"
+                       value="&syncErrorPanel.heading;"/>
+          <description id="sync-error-panel-subtitle"
+                       value="&syncErrorPanel.subTitle;"/>
+          <hbox class="sync-panel-button-box">
+            <spacer flex="1"/>
+            <button class="sync-panel-button"
+                    label="&syncErrorPanel.signInButton.label;"
+                    accesskey="&syncErrorPanel.signInButton.accesskey;"
+                    onclick="gFxAccounts.openSignInAgainPage();"/>
+          </hbox>
+        </vbox>
+      </hbox>
+    </panel>
+
+    <!-- Bookmarks and history tooltip -->
+    <tooltip id="bhTooltip"/>
+
+    <tooltip id="tabbrowser-tab-tooltip" onpopupshowing="gBrowser.createTooltip(event);"/>
+
+    <tooltip id="back-button-tooltip">
+      <label class="tooltip-label" value="&backButton.tooltip;"/>
+#ifdef XP_MACOSX
+      <label class="tooltip-label" value="&backForwardButtonMenuMac.tooltip;"/>
+#else
+      <label class="tooltip-label" value="&backForwardButtonMenu.tooltip;"/>
+#endif
+    </tooltip>
+
+    <tooltip id="forward-button-tooltip">
+      <label class="tooltip-label" value="&forwardButton.tooltip;"/>
+#ifdef XP_MACOSX
+      <label class="tooltip-label" value="&backForwardButtonMenuMac.tooltip;"/>
+#else
+      <label class="tooltip-label" value="&backForwardButtonMenu.tooltip;"/>
+#endif
+    </tooltip>
+
+#include popup-notifications.inc
+
+#include ../../components/customizableui/content/panelUI.inc.xul
+
+    <hbox id="downloads-animation-container" mousethrough="always">
+      <vbox id="downloads-notification-anchor">
+        <vbox id="downloads-indicator-notification"/>
+      </vbox>
+    </hbox>
+
+    <hbox id="bookmarked-notification-container" mousethrough="always">
+      <vbox id="bookmarked-notification-anchor">
+        <vbox id="bookmarked-notification"/>
+      </vbox>
+      <vbox id="bookmarked-notification-dropmarker-anchor">
+        <image id="bookmarked-notification-dropmarker-icon"/>
+      </vbox>
+    </hbox>
+
+    <tooltip id="dynamic-shortcut-tooltip"
+             onpopupshowing="UpdateDynamicShortcutTooltipText(this);"/>
+  </popupset>
+
+#ifdef CAN_DRAW_IN_TITLEBAR
+<vbox id="titlebar">
+  <hbox id="titlebar-content">
+    <spacer id="titlebar-spacer" flex="1"/>
+    <hbox id="titlebar-buttonbox-container">
+#ifdef XP_WIN
+      <hbox id="private-browsing-indicator-titlebar">
+        <hbox class="private-browsing-indicator"/>
+      </hbox>
+#endif
+      <hbox id="titlebar-buttonbox">
+        <toolbarbutton class="titlebar-button" id="titlebar-min" oncommand="window.minimize();"/>
+        <toolbarbutton class="titlebar-button" id="titlebar-max" oncommand="onTitlebarMaxClick();"/>
+        <toolbarbutton class="titlebar-button" id="titlebar-close" command="cmd_closeWindow"/>
+      </hbox>
+    </hbox>
+#ifdef XP_MACOSX
+    <!-- OS X does not natively support RTL for its titlebar items, so we prevent this secondary
+         buttonbox from reversing order in RTL by forcing an LTR direction. -->
+    <hbox id="titlebar-secondary-buttonbox" dir="ltr">
+      <hbox class="private-browsing-indicator"/>
+      <hbox id="titlebar-fullscreen-button"/>
+    </hbox>
+#endif
+  </hbox>
+</vbox>
+#endif
+
+<deck flex="1" id="tab-view-deck">
+<vbox flex="1" id="browser-panel">
+
+  <toolbox id="navigator-toolbox" mode="icons">
+    <!-- Menu -->
+    <toolbar type="menubar" id="toolbar-menubar" class="chromeclass-menubar" customizable="true"
+             defaultset="menubar-items"
+             mode="icons" iconsize="small"
+#ifdef MENUBAR_CAN_AUTOHIDE
+             toolbarname="&menubarCmd.label;"
+             accesskey="&menubarCmd.accesskey;"
+#if defined(MOZ_WIDGET_GTK) || defined(MOZ_WIDGET_QT)
+             autohide="true"
+#endif
+#endif
+             context="toolbar-context-menu">
+      <toolbaritem id="menubar-items" align="center"
+                   cui-areatype="toolbar">
+# The entire main menubar is placed into browser-menubar.inc, so that it can be shared by
+# hiddenWindow.xul.
+#include browser-menubar.inc
+      </toolbaritem>
+
+#ifdef CAN_DRAW_IN_TITLEBAR
+#ifndef XP_MACOSX
+      <hbox class="titlebar-placeholder" type="caption-buttons" ordinal="1000"
+            id="titlebar-placeholder-on-menubar-for-caption-buttons" persist="width"
+            skipintoolbarset="true"/>
+#endif
+#endif
+    </toolbar>
+
+    <toolbar id="TabsToolbar"
+             class="toolbar-primary"
+             fullscreentoolbar="true"
+             customizable="true"
+             mode="icons"
+             iconsize="small"
+             aria-label="&tabsToolbar.label;"
+             context="toolbar-context-menu"
+             defaultset="tabbrowser-tabs,new-tab-button,alltabs-button,tabs-closebutton"
+             collapsed="true">
+
+#if defined(MOZ_WIDGET_GTK) || defined(MOZ_WIDGET_QT)
+      <hbox id="private-browsing-indicator"
+            skipintoolbarset="true"/>
+#endif
+
+      <tabs id="tabbrowser-tabs"
+            class="tabbrowser-tabs"
+            tabbrowser="content"
+            flex="1"
+            setfocus="false"
+            tooltip="tabbrowser-tab-tooltip"
+            cui-areatype="toolbar"
+            stopwatchid="FX_TAB_CLICK_MS">
+        <tab class="tabbrowser-tab" selected="true" fadein="true"/>
+      </tabs>
+
+      <toolbarbutton id="new-tab-button"
+                     class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     label="&tabCmd.label;"
+                     command="cmd_newNavigatorTab"
+                     onclick="checkForMiddleClick(this, event);"
+                     tooltiptext="&newTabButton.tooltip;"
+                     ondrop="newTabButtonObserver.onDrop(event)"
+                     ondragover="newTabButtonObserver.onDragOver(event)"
+                     ondragenter="newTabButtonObserver.onDragOver(event)"
+                     ondragexit="newTabButtonObserver.onDragExit(event)"
+                     cui-areatype="toolbar"
+                     removable="true"/>
+
+      <toolbarbutton id="alltabs-button"
+                     class="toolbarbutton-1 chromeclass-toolbar-additional tabs-alltabs-button"
+                     type="menu"
+                     label="&listAllTabs.label;"
+                     tooltiptext="&listAllTabs.label;"
+                     removable="false">
+        <menupopup id="alltabs-popup"
+                   position="after_end">
+          <menuitem id="menu_tabview"
+                    class="menuitem-iconic"
+                    key="key_tabview"
+                    label="&viewTabGroups.label;"
+                    command="Browser:ToggleTabView"
+                    cui-areatype="toolbar"
+                    observes="tabviewGroupsNumber"/>
+          <menuseparator id="alltabs-popup-separator"/>
+        </menupopup>
+      </toolbarbutton>
+
+      <toolbarbutton id="tabs-closebutton"
+                     class="close-button tabs-closebutton close-icon"
+                     command="cmd_close"
+                     label="&closeTab.label;"
+                     cui-areatype="toolbar"
+                     tooltiptext="&closeTab.label;"/>
+
+#if !defined(MOZ_WIDGET_GTK) && !defined(MOZ_WIDGET_QT)
+      <hbox class="private-browsing-indicator" skipintoolbarset="true"/>
+#endif
+#ifdef CAN_DRAW_IN_TITLEBAR
+      <hbox class="titlebar-placeholder" type="caption-buttons"
+            id="titlebar-placeholder-on-TabsToolbar-for-captions-buttons" persist="width"
+#ifndef XP_MACOSX
+            ordinal="1000"
+#endif
+            skipintoolbarset="true"/>
+
+#ifdef XP_MACOSX
+      <hbox class="titlebar-placeholder" type="fullscreen-button"
+            id="titlebar-placeholder-on-TabsToolbar-for-fullscreen-button" persist="width"
+            skipintoolbarset="true"/>
+#endif
+#endif
+    </toolbar>
+
+    <!--
+           CAVEAT EMPTOR
+           Should you need to add items to the toolbar here, make sure to also add them
+           to the default placements of buttons in CustomizableUI.jsm, so the
+           customization code doesn't get confused.
+      -->
+    <toolbar id="nav-bar" class="toolbar-primary chromeclass-toolbar"
+             aria-label="&navbarCmd.label;"
+             fullscreentoolbar="true" mode="icons" customizable="true"
+             iconsize="small"
+             defaultset="urlbar-container,search-container,webrtc-status-button,bookmarks-menu-button,downloads-button,home-button,social-share-button,social-toolbar-item"
+             customizationtarget="nav-bar-customization-target"
+             overflowable="true"
+             overflowbutton="nav-bar-overflow-button"
+             overflowtarget="widget-overflow-list"
+             overflowpanel="widget-overflow"
+             context="toolbar-context-menu">
+
+      <hbox id="nav-bar-customization-target" flex="1">
+        <toolbaritem id="urlbar-container" flex="400" persist="width"
+                     forwarddisabled="true" title="&locationItem.title;" removable="false"
+                     cui-areatype="toolbar"
+                     class="chromeclass-location" overflows="false">
+          <toolbarbutton id="back-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                         label="&backCmd.label;"
+                         command="Browser:BackOrBackDuplicate"
+                         cui-areatype="toolbar"
+                         onclick="checkForMiddleClick(this, event);"
+                         tooltip="back-button-tooltip"
+                         context="backForwardMenu"/>
+          <toolbarbutton id="forward-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                         label="&forwardCmd.label;"
+                         command="Browser:ForwardOrForwardDuplicate"
+                         cui-areatype="toolbar"
+                         onclick="checkForMiddleClick(this, event);"
+                         tooltip="forward-button-tooltip"
+                         context="backForwardMenu"/>
+          <dummyobservertarget hidden="true"
+                               onbroadcast="if (this.getAttribute('disabled') == 'true')
+                                              this.parentNode.setAttribute('forwarddisabled', 'true');
+                                            else
+                                              this.parentNode.removeAttribute('forwarddisabled');">
+            <observes element="Browser:ForwardOrForwardDuplicate" attribute="disabled"/>
+          </dummyobservertarget>
+          <hbox id="urlbar-wrapper" flex="1" align="center">
+            <textbox id="urlbar" flex="1"
+                     placeholder="&urlbar.placeholder2;"
+                     type="autocomplete"
+                     autocompletesearch="urlinline history"
+                     autocompletesearchparam="enable-actions"
+                     autocompletepopup="PopupAutoCompleteRichResult"
+                     completeselectedindex="true"
+                     tabscrolling="true"
+                     showcommentcolumn="true"
+                     showimagecolumn="true"
+                     enablehistory="true"
+                     maxrows="6"
+                     newlines="stripsurroundingwhitespace"
+                     oninput="gBrowser.userTypedValue = this.value;"
+                     ontextentered="this.handleCommand(param);"
+                     ontextreverted="return this.handleRevert();"
+                     pageproxystate="invalid"
+                     onfocus="document.getElementById('identity-box').style.MozUserFocus= 'normal'"
+                     onblur="setTimeout(function() document.getElementById('identity-box').style.MozUserFocus = '', 0);">
+              <box id="notification-popup-box" hidden="true" align="center">
+                <image id="default-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="identity-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="geo-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="addons-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="indexedDB-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="password-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="webapps-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="plugins-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="web-notifications-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="plugin-install-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="mixed-content-blocked-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="webRTC-shareDevices-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="webRTC-sharingDevices-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="pointerLock-notification-icon" class="notification-anchor-icon" role="button"/>
+                <image id="servicesInstall-notification-icon" class="notification-anchor-icon" role="button"/>
+              </box>
+              <!-- Use onclick instead of normal popup= syntax since the popup
+                   code fires onmousedown, and hence eats our favicon drag events.
+                   We only add the identity-box button to the tab order when the location bar
+                   has focus, otherwise pressing F6 focuses it instead of the location bar -->
+              <box id="identity-box" role="button"
+                   align="center"
+                   onclick="gIdentityHandler.handleIdentityButtonEvent(event);"
+                   onkeypress="gIdentityHandler.handleIdentityButtonEvent(event);"
+                   ondragstart="gIdentityHandler.onDragStart(event);">
+                <image id="page-proxy-favicon"
+                       onclick="PageProxyClickHandler(event);"
+                       pageproxystate="invalid"/>
+                <hbox id="identity-icon-labels">
+                  <label id="identity-icon-label" class="plain" flex="1"/>
+                  <label id="identity-icon-country-label" class="plain"/>
+                </hbox>
+              </box>
+              <box id="urlbar-display-box" align="center">
+                <label id="urlbar-display" value="&urlbar.switchToTab.label;"/>
+              </box>
+              <hbox id="urlbar-icons">
+                <image id="page-report-button"
+                       class="urlbar-icon"
+                       hidden="true"
+                       tooltiptext="&pageReportIcon.tooltip;"
+                       onclick="gPopupBlockerObserver.onReportButtonClick(event);"/>
+              </hbox>
+              <toolbarbutton id="urlbar-go-button"
+                             class="chromeclass-toolbar-additional"
+                             onclick="gURLBar.handleCommand(event);"
+                             tooltiptext="&goEndCap.tooltip;"/>
+              <toolbarbutton id="urlbar-reload-button"
+                             class="chromeclass-toolbar-additional"
+                             command="Browser:ReloadOrDuplicate"
+                             onclick="checkForMiddleClick(this, event);"
+                             tooltiptext="&reloadButton.tooltip;"/>
+              <toolbarbutton id="urlbar-stop-button"
+                             class="chromeclass-toolbar-additional"
+                             command="Browser:Stop"
+                             tooltiptext="&stopButton.tooltip;"/>
+            </textbox>
+          </hbox>
+        </toolbaritem>
+
+        <toolbaritem id="search-container" title="&searchItem.title;"
+                     align="center" class="chromeclass-toolbar-additional panel-wide-item"
+                     cui-areatype="toolbar"
+                     flex="100" persist="width" removable="true">
+          <searchbar id="searchbar" flex="1"/>
+        </toolbaritem>
+
+        <toolbarbutton id="webrtc-status-button"
+                       class="toolbarbutton-1 chromeclass-toolbar-additional"
+                       type="menu"
+                       hidden="true"
+                       orient="horizontal"
+                       label="&webrtcIndicatorButton.label;"
+                       tooltiptext="&webrtcIndicatorButton.tooltip;"
+                       cui-areatype="toolbar"
+                       overflows="false">
+          <menupopup onpopupshowing="WebrtcIndicator.fillPopup(this);"
+                     onpopuphiding="WebrtcIndicator.clearPopup(this);"
+                     oncommand="WebrtcIndicator.menuCommand(event.target);"/>
+        </toolbarbutton>
+
+        <toolbarbutton id="bookmarks-menu-button"
+                       class="toolbarbutton-1 chromeclass-toolbar-additional"
+                       persist="class"
+                       removable="true"
+                       type="menu-button"
+                       label="&bookmarksMenuButton.label;"
+                       tooltip="dynamic-shortcut-tooltip"
+                       anchor="dropmarker"
+                       ondragenter="PlacesMenuDNDHandler.onDragEnter(event);"
+                       ondragover="PlacesMenuDNDHandler.onDragOver(event);"
+                       ondragleave="PlacesMenuDNDHandler.onDragLeave(event);"
+                       ondrop="PlacesMenuDNDHandler.onDrop(event);"
+                       cui-areatype="toolbar"
+                       oncommand="BookmarkingUI.onCommand(event);">
+          <menupopup id="BMB_bookmarksPopup"
+                     class="cui-widget-panel cui-widget-panelview cui-widget-panelWithFooter PanelUI-subView"
+                     placespopup="true"
+                     context="placesContext"
+                     openInTabs="children"
+                     oncommand="BookmarksEventHandler.onCommand(event, this.parentNode._placesView);"
+                     onclick="BookmarksEventHandler.onClick(event, this.parentNode._placesView);"
+                     onpopupshowing="BookmarkingUI.onPopupShowing(event);
+                                     BookmarkingUI.attachPlacesView(event, this);"
+                     tooltip="bhTooltip" popupsinherittooltip="true">
+            <menuitem id="BMB_viewBookmarksSidebar"
+                      class="subviewbutton"
+                      label="&viewBookmarksSidebar2.label;"
+                      type="checkbox"
+                      oncommand="toggleSidebar('viewBookmarksSidebar');">
+              <observes element="viewBookmarksSidebar" attribute="checked"/>
+            </menuitem>
+            <menuseparator/>
+            <menuitem id="BMB_subscribeToPageMenuitem"
+#ifndef XP_MACOSX
+                      class="menuitem-iconic subviewbutton"
+#else
+                      class="subviewbutton"
+#endif
+                      label="&subscribeToPageMenuitem.label;"
+                      oncommand="return FeedHandler.subscribeToFeed(null, event);"
+                      onclick="checkForMiddleClick(this, event);"
+                      observes="singleFeedMenuitemState"/>
+            <menu id="BMB_subscribeToPageMenupopup"
+#ifndef XP_MACOSX
+                  class="menu-iconic subviewbutton"
+#else
+                  class="subviewbutton"
+#endif
+                  label="&subscribeToPageMenupopup.label;"
+                  observes="multipleFeedsMenuState">
+              <menupopup id="BMB_subscribeToPageSubmenuMenupopup"
+                         onpopupshowing="return FeedHandler.buildFeedList(event.target);"
+                         oncommand="return FeedHandler.subscribeToFeed(null, event);"
+                         onclick="checkForMiddleClick(this, event);"/>
+            </menu>
+            <menuseparator/>
+            <menu id="BMB_bookmarksToolbar"
+                  class="menu-iconic bookmark-item subviewbutton"
+                  label="&personalbarCmd.label;"
+                  container="true">
+              <menupopup id="BMB_bookmarksToolbarPopup"
+                         placespopup="true"
+                         context="placesContext"
+                         onpopupshowing="if (!this.parentNode._placesView)
+                                           new PlacesMenu(event, 'place:folder=TOOLBAR',
+                                                          PlacesUIUtils.getViewForNode(this.parentNode.parentNode).options);">
+                <menuitem id="BMB_viewBookmarksToolbar"
+                          placesanonid="view-toolbar"
+                          toolbarId="PersonalToolbar"
+                          type="checkbox"
+                          oncommand="onViewToolbarCommand(event)"
+                          label="&viewBookmarksToolbar.label;"/>
+                <menuseparator/>
+                <!-- Bookmarks toolbar items -->
+              </menupopup>
+            </menu>
+            <menu id="BMB_unsortedBookmarks"
+                  class="menu-iconic bookmark-item subviewbutton"
+                  label="&bookmarksMenuButton.unsorted.label;"
+                  container="true">
+              <menupopup id="BMB_unsortedBookmarksPopup"
+                         placespopup="true"
+                         context="placesContext"
+                         onpopupshowing="if (!this.parentNode._placesView)
+                                           new PlacesMenu(event, 'place:folder=UNFILED_BOOKMARKS',
+                                                          PlacesUIUtils.getViewForNode(this.parentNode.parentNode).options);"/>
+            </menu>
+            <menuseparator/>
+            <!-- Bookmarks menu items will go here -->
+            <menuitem id="BMB_bookmarksShowAll"
+                      class="subviewbutton panel-subview-footer"
+                      label="&showAllBookmarks2.label;"
+                      command="Browser:ShowAllBookmarks"
+                      key="manBookmarkKb"/>
+          </menupopup>
+        </toolbarbutton>
+
+        <!-- This is a placeholder for the Downloads Indicator.  It is visible
+             during the customization of the toolbar, in the palette, and before
+             the Downloads Indicator overlay is loaded. -->
+        <toolbarbutton id="downloads-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                       oncommand="DownloadsIndicatorView.onCommand(event);"
+                       ondrop="DownloadsIndicatorView.onDrop(event);"
+                       ondragover="DownloadsIndicatorView.onDragOver(event);"
+                       ondragenter="DownloadsIndicatorView.onDragOver(event);"
+                       label="&downloads.label;"
+                       removable="true"
+                       cui-areatype="toolbar"
+                       tooltiptext="&downloads.tooltip;"/>
+
+        <toolbarbutton id="home-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                       persist="class" removable="true"
+                       label="&homeButton.label;"
+                       ondragover="homeButtonObserver.onDragOver(event)"
+                       ondragenter="homeButtonObserver.onDragOver(event)"
+                       ondrop="homeButtonObserver.onDrop(event)"
+                       ondragexit="homeButtonObserver.onDragExit(event)"
+                       onclick="BrowserGoHome(event);"
+                       cui-areatype="toolbar"
+                       aboutHomeOverrideTooltip="&abouthome.pageTitle;"/>
+
+
+        <toolbarbutton id="social-share-button"
+                       class="toolbarbutton-1 chromeclass-toolbar-additional"
+                       hidden="true"
+                       overflows="false"
+                       label="&sharePageCmd.label;"
+                       tooltiptext="&sharePageCmd.label;"
+                       cui-areatype="toolbar"
+                       command="Social:SharePage"/>
+      </hbox>
+
+      <toolbarbutton id="nav-bar-overflow-button"
+                     class="toolbarbutton-1 chromeclass-toolbar-additional overflow-button"
+                     cui-areatype="toolbar"
+                     skipintoolbarset="true"
+                     tooltiptext="&navbarOverflow.label;"/>
+
+      <toolbaritem id="PanelUI-button"
+                   class="chromeclass-toolbar-additional"
+                   cui-areatype="toolbar"
+                   removable="false">
+        <toolbarbutton id="PanelUI-menu-button"
+                       class="toolbarbutton-1"
+                       cui-areatype="toolbar"
+                       label="&brandShortName;"
+                       tooltiptext="&appmenu.tooltip;"/>
+      </toolbaritem>
+
+      <hbox id="window-controls" hidden="true" pack="end" skipintoolbarset="true"
+            ordinal="1000">
+        <toolbarbutton id="minimize-button"
+                       tooltiptext="&fullScreenMinimize.tooltip;"
+                       oncommand="window.minimize();"/>
+
+        <toolbarbutton id="restore-button"
+#ifdef XP_MACOSX
+# Prior to 10.7 there wasn't a native fullscreen button so we use #restore-button
+# to exit fullscreen and want it to behave like other toolbar buttons.
+                       class="toolbarbutton-1"
+                       cui-areatype="toolbar"
+#endif
+                       tooltiptext="&fullScreenRestore.tooltip;"
+                       oncommand="BrowserFullScreen();"/>
+
+        <toolbarbutton id="close-button"
+                       tooltiptext="&fullScreenClose.tooltip;"
+                       oncommand="BrowserTryToCloseWindow();"/>
+      </hbox>
+    </toolbar>
+
+    <toolbarset id="customToolbars" context="toolbar-context-menu"/>
+
+    <toolbar id="PersonalToolbar"
+             mode="icons" iconsize="small"
+             class="chromeclass-directories"
+             context="toolbar-context-menu"
+             defaultset="personal-bookmarks"
+             toolbarname="&personalbarCmd.label;" accesskey="&personalbarCmd.accesskey;"
+             collapsed="true"
+             customizable="true">
+      <toolbaritem id="personal-bookmarks"
+                   flex="1"
+                   title="&bookmarksToolbarItem.label;"
+                   cui-areatype="toolbar"
+                   removable="true">
+        <toolbarbutton id="bookmarks-toolbar-placeholder"
+                       class="toolbarbutton-1"
+                       mousethrough="never"
+                       label="&bookmarksToolbarItem.label;"
+                       oncommand="PlacesToolbarHelper.onPlaceholderCommand();"/>
+        <hbox flex="1"
+              id="PlacesToolbar"
+              context="placesContext"
+              onclick="BookmarksEventHandler.onClick(event, this._placesView);"
+              oncommand="BookmarksEventHandler.onCommand(event, this._placesView);"
+              tooltip="bhTooltip"
+              popupsinherittooltip="true">
+          <hbox flex="1">
+            <hbox id="PlacesToolbarDropIndicatorHolder" align="center" collapsed="true">
+              <image id="PlacesToolbarDropIndicator"
+                     mousethrough="always"
+                     collapsed="true"/>
+            </hbox>
+            <scrollbox orient="horizontal"
+                       id="PlacesToolbarItems"
+                       flex="1"/>
+            <toolbarbutton type="menu"
+                           id="PlacesChevron"
+                           class="chevron"
+                           mousethrough="never"
+                           collapsed="true"
+                           tooltiptext="&bookmarksToolbarChevron.tooltip;"
+                           onpopupshowing="document.getElementById('PlacesToolbar')
+                                                   ._placesView._onChevronPopupShowing(event);">
+              <menupopup id="PlacesChevronPopup"
+                         placespopup="true"
+                         tooltip="bhTooltip" popupsinherittooltip="true"
+                         context="placesContext"/>
+            </toolbarbutton>
+          </hbox>
+        </hbox>
+      </toolbaritem>
+    </toolbar>
+
+    <!-- This is a shim which will go away ASAP. See bug 749804 for details -->
+    <toolbar id="addon-bar" toolbar-delegate="nav-bar" mode="icons" iconsize="small"
+             customizable="true">
+      <hbox id="addonbar-closebutton"/>
+      <statusbar id="status-bar"/>
+    </toolbar>
+
+    <toolbarpalette id="BrowserToolbarPalette">
+
+# Update primaryToolbarButtons in browser/themes/shared/browser.inc when adding
+# or removing default items with the toolbarbutton-1 class.
+
+      <toolbarbutton id="print-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+#ifdef XP_MACOSX
+                     command="cmd_print" tooltip="dynamic-shortcut-tooltip"
+#else
+                     command="cmd_printPreview" tooltiptext="&printButton.tooltip;"
+#endif
+                     label="&printButton.label;"/>
+
+
+      <toolbarbutton id="new-window-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     label="&newNavigatorCmd.label;"
+                     command="key_newNavigator"
+                     tooltip="dynamic-shortcut-tooltip"
+                     ondrop="newWindowButtonObserver.onDrop(event)"
+                     ondragover="newWindowButtonObserver.onDragOver(event)"
+                     ondragenter="newWindowButtonObserver.onDragOver(event)"
+                     ondragexit="newWindowButtonObserver.onDragExit(event)"/>
+
+      <toolbarbutton id="fullscreen-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     observes="View:FullScreen"
+                     type="checkbox"
+                     label="&fullScreenCmd.label;"
+                     tooltip="dynamic-shortcut-tooltip"/>
+
+#ifdef MOZ_SERVICES_SYNC
+      <toolbarbutton id="sync-button"
+                     class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     label="&syncToolbarButton.label;"
+                     oncommand="gSyncUI.handleToolbarButton()"/>
+#endif
+
+      <toolbarbutton id="tabview-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+                     label="&tabGroupsButton.label;"
+                     command="Browser:ToggleTabView"
+                     tooltip="dynamic-shortcut-tooltip"
+                     observes="tabviewGroupsNumber"/>
+    </toolbarpalette>
+  </toolbox>
+
+  <hbox id="fullscr-toggler" collapsed="true"/>
+
+  <deck id="content-deck" flex="1">
+    <hbox flex="1" id="browser">
+      <vbox id="browser-border-start" hidden="true" layer="true"/>
+      <vbox id="sidebar-box" hidden="true" class="chromeclass-extrachrome">
+        <sidebarheader id="sidebar-header" align="center">
+          <label id="sidebar-title" persist="value" flex="1" crop="end" control="sidebar"/>
+          <image id="sidebar-throbber"/>
+          <toolbarbutton class="tabs-closebutton close-icon" tooltiptext="&sidebarCloseButton.tooltip;" oncommand="toggleSidebar();"/>
+        </sidebarheader>
+        <browser id="sidebar" flex="1" autoscroll="false" disablehistory="true"
+                  style="min-width: 14em; width: 18em; max-width: 36em;"/>
+      </vbox>
+
+      <splitter id="sidebar-splitter" class="chromeclass-extrachrome sidebar-splitter" hidden="true"/>
+      <vbox id="appcontent" flex="1">
+        <tabbrowser id="content"
+                    flex="1" contenttooltip="aHTMLTooltip"
+                    tabcontainer="tabbrowser-tabs"
+                    contentcontextmenu="contentAreaContextMenu"
+                    autocompletepopup="PopupAutoComplete"
+                    selectpopup="ContentSelectDropdown"
+                    onclick="contentAreaClick(event, false);"/>
+        <chatbar id="pinnedchats" layer="true" mousethrough="always" hidden="true"/>
+      </vbox>
+      <splitter id="social-sidebar-splitter"
+                class="chromeclass-extrachrome sidebar-splitter"
+                observes="socialSidebarBroadcaster"/>
+      <vbox id="social-sidebar-box"
+            class="chromeclass-extrachrome"
+            observes="socialSidebarBroadcaster"
+            persist="width">
+
+        <sidebarheader id="social-sidebar-header" class="sidebar-header" align="center">
+          <image id="social-sidebar-favico"/>
+          <label id="social-sidebar-title" class="sidebar-title" persist="value" flex="1" crop="end" control="sidebar"/>
+          <toolbarbutton id="social-sidebar-button"
+                         class="toolbarbutton-1"
+                         type="menu">
+            <menupopup id="social-statusarea-popup" position="after_end">
+              <menuitem class="social-toggle-sidebar-menuitem"
+                        type="checkbox"
+                        autocheck="false"
+                        command="Social:ToggleSidebar"
+                        label="&social.toggleSidebar.label;"
+                        accesskey="&social.toggleSidebar.accesskey;"/>
+              <menuitem class="social-toggle-notifications-menuitem"
+                        type="checkbox"
+                        autocheck="false"
+                        command="Social:ToggleNotifications"
+                        label="&social.toggleNotifications.label;"
+                        accesskey="&social.toggleNotifications.accesskey;"/>
+              <menuitem class="social-toggle-menuitem" command="Social:Toggle"/>
+              <menuseparator/>
+              <menuseparator class="social-provider-menu" hidden="true"/>
+              <menuitem class="social-addons-menuitem" command="Social:Addons"
+                        label="&social.addons.label;"/>
+              <menuitem label="&social.learnMore.label;"
+                        accesskey="&social.learnMore.accesskey;"
+                        oncommand="SocialUI.showLearnMore();"/>
+            </menupopup>
+          </toolbarbutton>
+        </sidebarheader>
+
+        <browser id="social-sidebar-browser"
+                 type="content"
+                 context="contentAreaContextMenu"
+                 disableglobalhistory="true"
+                 tooltip="aHTMLTooltip"
+                 popupnotificationanchor="social-sidebar-favico"
+                 flex="1"
+                 style="min-width: 14em; width: 18em; max-width: 36em;"/>
+      </vbox>
+      <vbox id="browser-border-end" hidden="true" layer="true"/>
+    </hbox>
+#include ../../components/customizableui/content/customizeMode.inc.xul
+  </deck>
+
+  <hbox id="full-screen-warning-container" hidden="true" fadeout="true">
+    <hbox style="width: 100%;" pack="center"> <!-- Inner hbox needed due to bug 579776. -->
+      <vbox id="full-screen-warning-message" align="center">
+        <description id="full-screen-domain-text"/>
+        <description class="full-screen-description" value="&fullscreenExitHint2.value;"/>
+        <vbox id="full-screen-approval-pane" align="center">
+          <hbox>
+#ifndef XP_UNIX
+            <button label="&fullscreenExitButton.label;"
+                    oncommand="FullScreen.setFullscreenAllowed(false);"
+                    class="full-screen-approval-button"/>
+            <button label="&fullscreenAllowButton.label;"
+                    oncommand="FullScreen.setFullscreenAllowed(true);"
+                    class="full-screen-approval-button"/>
+#else
+            <button label="&fullscreenAllowButton.label;"
+                    oncommand="FullScreen.setFullscreenAllowed(true);"
+                    class="full-screen-approval-button"/>
+            <button label="&fullscreenExitButton.label;"
+                    oncommand="FullScreen.setFullscreenAllowed(false);"
+                    class="full-screen-approval-button"/>
+#endif
+          </hbox>
+          <checkbox id="full-screen-remember-decision"/>
+        </vbox>
+      </vbox>
+    </hbox>
+  </hbox>
+
+  <vbox id="browser-bottombox" layer="true">
+    <notificationbox id="global-notificationbox"/>
+    <toolbar id="developer-toolbar"
+             hidden="true">
+#ifdef XP_MACOSX
+          <toolbarbutton id="developer-toolbar-closebutton"
+                         class="devtools-closebutton"
+                         oncommand="DeveloperToolbar.hide();"
+                         tooltiptext="&devToolbarCloseButton.tooltiptext;"/>
+#endif
+          <stack class="gclitoolbar-stack-node" flex="1">
+            <textbox class="gclitoolbar-input-node" rows="1"/>
+            <hbox class="gclitoolbar-complete-node"/>
+          </stack>
+          <toolbarbutton id="developer-toolbar-toolbox-button"
+                         class="developer-toolbar-button"
+                         observes="devtoolsMenuBroadcaster_DevToolbox"
+                         tooltiptext="&devToolbarToolsButton.tooltip;"/>
+#ifndef XP_MACOSX
+          <toolbarbutton id="developer-toolbar-closebutton"
+                         class="devtools-closebutton"
+                         oncommand="DeveloperToolbar.hide();"
+                         tooltiptext="&devToolbarCloseButton.tooltiptext;"/>
+#endif
+   </toolbar>
+  </vbox>
+
+  <svg:svg height="0">
+#include tab-shape.inc.svg
+
+#ifndef XP_MACOSX
+    <svg:clipPath id="keyhole-forward-clip-path" clipPathUnits="objectBoundingBox">
+      <svg:path d="m 0,0 c .3,.25 .3,.75, 0,1 l 1,0 0,-1 z"/>
+    </svg:clipPath>
+    <svg:clipPath id="urlbar-back-button-clip-path" clipPathUnits="userSpaceOnUse">
+      <svg:path d="m 0,-5 l 0,7.8 c 2.5,3.2 4,6.2 4,10.2 c 0,4 -1.5,7 -4,10 l 0,22l10000,0 l 0,-50 l -10000,0 z"/>
+    </svg:clipPath>
+#else
+    <svg:clipPath id="osx-keyhole-forward-clip-path" clipPathUnits="userSpaceOnUse">
+      <svg:path d="M 0,0 a 16 16 0 0 1 0,24 l 10000,0 l 0,-24 l -10000,0 z"/>
+    </svg:clipPath>
+    <svg:clipPath id="osx-urlbar-back-button-clip-path" clipPathUnits="userSpaceOnUse">
+      <svg:path d="M -12,-5 a 16 16 0 0 1 0,34 l 10000,0 l 0,-34 l -10000,0 z"/>
+    </svg:clipPath>
+#endif
+  </svg:svg>
+
+</vbox>
+# <iframe id="tab-view"> is dynamically appended as the 2nd child of #tab-view-deck.
+#     Introducing the iframe dynamically, as needed, was found to be better than
+#     starting with an empty iframe here in browser.xul from a Ts standpoint.
+</deck>
+
+</window>
diff --git a/browser/base/jar.mn b/browser/base/jar.mn
--- a/browser/base/jar.mn
+++ b/browser/base/jar.mn
@@ -66,16 +66,18 @@ browser.jar:
         content/browser/aboutRobots-icon.png          (content/aboutRobots-icon.png)
         content/browser/aboutRobots-widget-left.png   (content/aboutRobots-widget-left.png)
         content/browser/aboutSocialError.xhtml        (content/aboutSocialError.xhtml)
         content/browser/aboutTabCrashed.js            (content/aboutTabCrashed.js)
         content/browser/aboutTabCrashed.xhtml         (content/aboutTabCrashed.xhtml)
 *       content/browser/browser.css                   (content/browser.css)
 *       content/browser/browser.js                    (content/browser.js)
 *       content/browser/browser.xul                   (content/browser.xul)
+*       content/browser/browser-kde.xul               (content/browser-kde.xul)
+%       override chrome://browser/content/browser.xul chrome://browser/content/browser-kde.xul desktop=kde
 *       content/browser/browser-tabPreviews.xml       (content/browser-tabPreviews.xml)
 *       content/browser/chatWindow.xul                (content/chatWindow.xul)
         content/browser/content.js                    (content/content.js)
         content/browser/newtab/newTab.xul             (content/newtab/newTab.xul)
 *       content/browser/newtab/newTab.js              (content/newtab/newTab.js)
         content/browser/newtab/newTab.css             (content/newtab/newTab.css)
         content/browser/newtab/preloaderContent.js    (content/newtab/preloaderContent.js)
 *       content/browser/pageinfo/pageInfo.xul         (content/pageinfo/pageInfo.xul)
diff --git a/browser/components/build/nsModule.cpp b/browser/components/build/nsModule.cpp
--- a/browser/components/build/nsModule.cpp
+++ b/browser/components/build/nsModule.cpp
@@ -8,17 +8,17 @@
 #include "nsBrowserCompsCID.h"
 #include "DirectoryProvider.h"
 
 #if defined(XP_WIN)
 #include "nsWindowsShellService.h"
 #elif defined(XP_MACOSX)
 #include "nsMacShellService.h"
 #elif defined(MOZ_WIDGET_GTK)
-#include "nsGNOMEShellService.h"
+#include "nsUnixShellService.h"
 #endif
 
 #if defined(XP_WIN)
 #include "nsIEHistoryEnumerator.h"
 #endif
 
 #include "rdf.h"
 #include "nsFeedSniffer.h"
@@ -31,18 +31,16 @@ using namespace mozilla::browser;
 
 /////////////////////////////////////////////////////////////////////////////
 
 NS_GENERIC_FACTORY_CONSTRUCTOR(DirectoryProvider)
 #if defined(XP_WIN)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsWindowsShellService)
 #elif defined(XP_MACOSX)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsMacShellService)
-#elif defined(MOZ_WIDGET_GTK)
-NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsGNOMEShellService, Init)
 #endif
 
 #if defined(XP_WIN)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsIEHistoryEnumerator)
 #endif
 
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsFeedSniffer)
 
@@ -60,17 +58,17 @@ NS_DEFINE_NAMED_CID(NS_WINIEHISTORYENUME
 NS_DEFINE_NAMED_CID(NS_SHELLSERVICE_CID);
 #endif
 
 static const mozilla::Module::CIDEntry kBrowserCIDs[] = {
     { &kNS_BROWSERDIRECTORYPROVIDER_CID, false, nullptr, DirectoryProviderConstructor },
 #if defined(XP_WIN)
     { &kNS_SHELLSERVICE_CID, false, nullptr, nsWindowsShellServiceConstructor },
 #elif defined(MOZ_WIDGET_GTK)
-    { &kNS_SHELLSERVICE_CID, false, nullptr, nsGNOMEShellServiceConstructor },
+    { &kNS_SHELLSERVICE_CID, false, nullptr, nsUnixShellServiceConstructor },
 #endif
     { &kNS_FEEDSNIFFER_CID, false, nullptr, nsFeedSnifferConstructor },
     { &kNS_BROWSER_ABOUT_REDIRECTOR_CID, false, nullptr, AboutRedirector::Create },
 #if defined(XP_WIN)
     { &kNS_WINIEHISTORYENUMERATOR_CID, false, nullptr, nsIEHistoryEnumeratorConstructor },
 #elif defined(XP_MACOSX)
     { &kNS_SHELLSERVICE_CID, false, nullptr, nsMacShellServiceConstructor },
 #endif
diff --git a/browser/components/preferences/advanced.js b/browser/components/preferences/advanced.js
--- a/browser/components/preferences/advanced.js
+++ b/browser/components/preferences/advanced.js
@@ -24,16 +24,22 @@ var gAdvancedPane = {
     if (extraArgs && extraArgs["advancedTab"]){
       advancedPrefs.selectedTab = document.getElementById(extraArgs["advancedTab"]);
     } else {
       var preference = document.getElementById("browser.preferences.advanced.selectedTabIndex");
       if (preference.value !== null)
         advancedPrefs.selectedIndex = preference.value;
     }
 
+    var env = Components.classes["@mozilla.org/process/environment;1"]
+                        .getService(Components.interfaces.nsIEnvironment);
+    var kde_session = 0;
+    if (env.get('KDE_FULL_SESSION') == "true")
+      kde_session = 1;
+
 #ifdef HAVE_SHELL_SERVICE
     this.updateSetDefaultBrowser();
 #ifdef XP_WIN
     // In Windows 8 we launch the control panel since it's the only
     // way to get all file type association prefs. So we don't know
     // when the user will select the default.  We refresh here periodically
     // in case the default changes.  On other Windows OS's defaults can also
     // be set while the prefs are open.
@@ -903,14 +909,25 @@ var gAdvancedPane = {
    * Set browser as the operating system default browser.
    */
   setDefaultBrowser: function()
   {
     let shellSvc = getShellService();
     if (!shellSvc)
       return;
     shellSvc.setDefaultBrowser(true, false);
+    if (kde_session == 1) {
+      var shellObj = Components.classes["@mozilla.org/file/local;1"]
+                               .createInstance(Components.interfaces.nsILocalFile);
+      shellObj.initWithPath("/usr/bin/kwriteconfig");
+      var process = Components.classes["@mozilla.org/process/util;1"]
+                              .createInstance(Components.interfaces.nsIProcess);
+      process.init(shellObj);
+      var args = ["--file", "kdeglobals", "--group", "General", "--key",
+          "BrowserApplication", "MozillaFirefox"];
+      process.run(false, args, args.length);
+    }
     let selectedIndex =
       shellSvc.isDefaultBrowser(false, true) ? 1 : 0;
     document.getElementById("setDefaultPane").selectedIndex = selectedIndex;
   }
 #endif
 };
diff --git a/browser/components/shell/src/Makefile.in b/browser/components/shell/src/Makefile.in
--- a/browser/components/shell/src/Makefile.in
+++ b/browser/components/shell/src/Makefile.in
@@ -2,10 +2,12 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 include $(topsrcdir)/config/rules.mk
 
 CXXFLAGS += $(TK_CFLAGS)
 
+LOCAL_INCLUDES += -I$(topsrcdir)/toolkit/xre
+
 clobber::
 	rm -f $(DIST)/lib/$(LIBRARY_NAME).lib
diff --git a/browser/components/shell/src/moz.build b/browser/components/shell/src/moz.build
--- a/browser/components/shell/src/moz.build
+++ b/browser/components/shell/src/moz.build
@@ -10,16 +10,18 @@ if CONFIG['OS_ARCH'] == 'WINNT':
     ]
 elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
     SOURCES += [
         'nsMacShellService.cpp',
     ]
 elif CONFIG['MOZ_WIDGET_GTK']:
     SOURCES += [
         'nsGNOMEShellService.cpp',
+	'nsKDEShellService.cpp',
+	'nsUnixShellService.cpp',
     ]
 
 if SOURCES:
     FINAL_LIBRARY = 'browsercomps'
 
 EXTRA_COMPONENTS += [
     'nsSetDefaultBrowser.js',
     'nsSetDefaultBrowser.manifest',
diff --git a/browser/components/shell/src/nsKDEShellService.cpp b/browser/components/shell/src/nsKDEShellService.cpp
new file mode 100644
--- /dev/null
+++ b/browser/components/shell/src/nsKDEShellService.cpp
@@ -0,0 +1,234 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsKDEShellService.h"
+#include "nsShellService.h"
+#include "nsKDEUtils.h"
+#include "nsCOMPtr.h"
+#include "nsIPrefService.h"
+#include "nsIProcess.h"
+#include "nsIFile.h"
+#include "nsServiceManagerUtils.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIMutableArray.h"
+#include "nsISupportsPrimitives.h"
+#include "nsArrayUtils.h"
+
+nsresult
+nsKDEShellService::Init()
+    {
+    if( !nsKDEUtils::kdeSupport())
+        return NS_ERROR_NOT_AVAILABLE;
+    return NS_OK;
+    }
+
+NS_IMPL_ISUPPORTS1(nsKDEShellService, nsIShellService)
+
+NS_IMETHODIMP
+nsKDEShellService::IsDefaultBrowser(bool aStartupCheck,
+                                    bool aForAllTypes,
+                                    bool* aIsDefaultBrowser)
+    {
+    *aIsDefaultBrowser = false;
+    if (aStartupCheck)
+        mCheckedThisSession = true;
+
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if (!command)
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> str = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if (!str)
+        return NS_ERROR_FAILURE;
+
+    str->SetData( NS_LITERAL_CSTRING( "ISDEFAULTBROWSER" ));
+    command->AppendElement( str, false );
+
+    if( nsKDEUtils::command( command ))
+        *aIsDefaultBrowser = true;
+    return NS_OK;
+    }
+
+NS_IMETHODIMP
+nsKDEShellService::SetDefaultBrowser(bool aClaimAllTypes,
+                                     bool aForAllUsers)
+    {
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if (!command)
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> cmdstr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    nsCOMPtr<nsISupportsCString> paramstr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if (!cmdstr || !paramstr)
+        return NS_ERROR_FAILURE;
+
+    cmdstr->SetData( NS_LITERAL_CSTRING( "SETDEFAULTBROWSER" ));
+    command->AppendElement( cmdstr, false );
+
+    paramstr->SetData( aClaimAllTypes ? NS_LITERAL_CSTRING( "ALLTYPES" ) : NS_LITERAL_CSTRING( "NORMAL" ));
+    command->AppendElement( paramstr, false );
+
+    return nsKDEUtils::command( command ) ? NS_OK : NS_ERROR_FAILURE;
+    }
+
+NS_IMETHODIMP
+nsKDEShellService::GetShouldCheckDefaultBrowser(bool* aResult)
+{
+  // If we've already checked, the browser has been started and this is a
+  // new window open, and we don't want to check again.
+  if (mCheckedThisSession) {
+    *aResult = false;
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIPrefBranch> prefs;
+  nsCOMPtr<nsIPrefService> pserve(do_GetService(NS_PREFSERVICE_CONTRACTID));
+  if (pserve)
+    pserve->GetBranch("", getter_AddRefs(prefs));
+
+  if (prefs)
+    prefs->GetBoolPref(PREF_CHECKDEFAULTBROWSER, aResult);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::SetShouldCheckDefaultBrowser(bool aShouldCheck)
+{
+  nsCOMPtr<nsIPrefBranch> prefs;
+  nsCOMPtr<nsIPrefService> pserve(do_GetService(NS_PREFSERVICE_CONTRACTID));
+  if (pserve)
+    pserve->GetBranch("", getter_AddRefs(prefs));
+
+  if (prefs)
+    prefs->SetBoolPref(PREF_CHECKDEFAULTBROWSER, aShouldCheck);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::GetCanSetDesktopBackground(bool* aResult)
+{
+  *aResult = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsKDEShellService::SetDesktopBackground(nsIDOMElement* aElement,
+                                          PRInt32 aPosition)
+    {
+    return NS_ERROR_NOT_IMPLEMENTED;
+    }
+
+NS_IMETHODIMP
+nsKDEShellService::GetDesktopBackgroundColor(PRUint32 *aColor)
+    {
+    return NS_ERROR_NOT_IMPLEMENTED;
+    }
+
+NS_IMETHODIMP
+nsKDEShellService::SetDesktopBackgroundColor(PRUint32 aColor)
+    {
+    return NS_ERROR_NOT_IMPLEMENTED;
+    }
+
+NS_IMETHODIMP
+nsKDEShellService::OpenApplication(PRInt32 aApplication)
+    {
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if (!command)
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> str = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if (!str)
+        return NS_ERROR_FAILURE;
+
+    if( aApplication == APPLICATION_MAIL )
+        str->SetData( NS_LITERAL_CSTRING( "OPENMAIL" ));
+    else if( aApplication == APPLICATION_NEWS )
+        str->SetData( NS_LITERAL_CSTRING( "OPENNEWS" ));
+    else
+        return NS_ERROR_NOT_IMPLEMENTED;
+
+    command->AppendElement( str, false );
+    return nsKDEUtils::command( command ) ? NS_OK : NS_ERROR_FAILURE;
+    }
+
+NS_IMETHODIMP
+nsKDEShellService::OpenApplicationWithURI(nsIFile* aApplication, const nsACString& aURI)
+    {
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if (!command)
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> cmdstr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    nsCOMPtr<nsISupportsCString> appstr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    nsCOMPtr<nsISupportsCString> uristr = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if (!cmdstr || !appstr || !uristr)
+        return NS_ERROR_FAILURE;
+
+    cmdstr->SetData( NS_LITERAL_CSTRING( "RUN" ));
+    command->AppendElement( cmdstr, false );
+    nsAutoCString app;
+    nsresult rv = aApplication->GetNativePath( app );
+    NS_ENSURE_SUCCESS( rv, rv );
+    appstr->SetData( app );
+    command->AppendElement( appstr, false );
+    uristr->SetData( aURI );
+    command->AppendElement( uristr, false );
+    return nsKDEUtils::command( command ) ? NS_OK : NS_ERROR_FAILURE;
+    }
+
+NS_IMETHODIMP
+nsKDEShellService::GetDefaultFeedReader(nsIFile** _retval)
+    {
+    *_retval = nullptr;
+
+    nsCOMPtr<nsIMutableArray> command = do_CreateInstance( NS_ARRAY_CONTRACTID );
+    if( !command )
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> str = do_CreateInstance( NS_SUPPORTS_CSTRING_CONTRACTID );
+    if( !str )
+        return NS_ERROR_FAILURE;
+
+    str->SetData( NS_LITERAL_CSTRING( "GETDEFAULTFEEDREADER" ));
+    command->AppendElement( str, false );
+
+    nsCOMPtr<nsIArray> output;
+    if( !nsKDEUtils::command( command, getter_AddRefs( output ) ) )
+        return NS_ERROR_FAILURE;
+
+    PRUint32 length;
+    output->GetLength( &length );
+    if( length != 1 )
+        return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsISupportsCString> resstr = do_QueryElementAt( output, 0 );
+    if( !resstr )
+        return NS_ERROR_FAILURE;
+
+    nsAutoCString path;
+    resstr->GetData( path );
+    if (path.IsEmpty())
+        return NS_ERROR_FAILURE;
+
+    nsresult rv;
+    nsCOMPtr<nsIFile> defaultReader =
+        do_CreateInstance("@mozilla.org/file/local;1", &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = defaultReader->InitWithNativePath(path);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    bool exists;
+    rv = defaultReader->Exists(&exists);
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (!exists)
+        return NS_ERROR_FAILURE;
+
+    NS_ADDREF(*_retval = defaultReader);
+    return NS_OK;
+    }
diff --git a/browser/components/shell/src/nsKDEShellService.h b/browser/components/shell/src/nsKDEShellService.h
new file mode 100644
--- /dev/null
+++ b/browser/components/shell/src/nsKDEShellService.h
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Shell Service.
+ *
+ * The Initial Developer of the Original Code is mozilla.org.
+ * Portions created by the Initial Developer are Copyright (C) 2004
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nskdeshellservice_h____
+#define nskdeshellservice_h____
+
+#include "nsIShellService.h"
+#include "nsStringAPI.h"
+
+class nsKDEShellService : public nsIShellService
+{
+public:
+  nsKDEShellService() : mCheckedThisSession(PR_FALSE) { }
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISHELLSERVICE
+
+  nsresult Init() NS_HIDDEN;
+
+private:
+  ~nsKDEShellService() {}
+
+  PRPackedBool mCheckedThisSession;
+};
+
+#endif // nskdeshellservice_h____
diff --git a/browser/components/shell/src/nsUnixShellService.cpp b/browser/components/shell/src/nsUnixShellService.cpp
new file mode 100644
--- /dev/null
+++ b/browser/components/shell/src/nsUnixShellService.cpp
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Shell Service.
+ *
+ * The Initial Developer of the Original Code is mozilla.org.
+ * Portions created by the Initial Developer are Copyright (C) 2004
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsUnixShellService.h"
+#include "nsGNOMEShellService.h"
+#include "nsKDEShellService.h"
+#include "nsKDEUtils.h"
+#include "mozilla/ModuleUtils.h"
+
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsGNOMEShellService, Init)
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsKDEShellService, Init)
+
+NS_METHOD
+nsUnixShellServiceConstructor(nsISupports *aOuter, REFNSIID aIID, void **aResult)
+{
+    if( nsKDEUtils::kdeSupport())
+        return nsKDEShellServiceConstructor( aOuter, aIID, aResult );
+    return nsGNOMEShellServiceConstructor( aOuter, aIID, aResult );
+}
diff --git a/browser/components/shell/src/nsUnixShellService.h b/browser/components/shell/src/nsUnixShellService.h
new file mode 100644
--- /dev/null
+++ b/browser/components/shell/src/nsUnixShellService.h
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Shell Service.
+ *
+ * The Initial Developer of the Original Code is mozilla.org.
+ * Portions created by the Initial Developer are Copyright (C) 2004
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsunixshellservice_h____
+#define nsunixshellservice_h____
+
+#include "nsIShellService.h"
+
+NS_METHOD
+nsUnixShellServiceConstructor(nsISupports *aOuter, REFNSIID aIID, void **aResult);
+
+#endif // nsunixshellservice_h____
diff --git a/browser/installer/package-manifest.in b/browser/installer/package-manifest.in
--- a/browser/installer/package-manifest.in
+++ b/browser/installer/package-manifest.in
@@ -654,19 +654,21 @@
 @BINPATH@/defaults/autoconfig/prefcalls.js
 @BINPATH@/browser/defaults/profile/prefs.js
 
 #ifndef LIBXUL_SDK
 ; Warning: changing the path to channel-prefs.js can cause bugs (Bug 756325)
 ; Technically this is an app pref file, but we are keeping it in the original
 ; gre location for now.
 @BINPATH@/defaults/pref/channel-prefs.js
+@BINPATH@/defaults/pref/kde.js
 #else
 ; For Fx-on-xr, channel-prefs lives with the app preferences. (Bug 762588)
 @BINPATH@/@PREF_DIR@/channel-prefs.js
+@BINPATH@/@PREF_DIR@/kde.js
 #endif
 
 ; Services (gre) prefs
 #ifdef MOZ_SERVICES_NOTIFICATIONS
 @BINPATH@/defaults/pref/services-notifications.js
 #endif
 #ifdef MOZ_SERVICES_SYNC
 @BINPATH@/defaults/pref/services-sync.js