Index: epiphany-2.29.3/data/epiphany.schemas.in
===================================================================
--- epiphany-2.29.3.orig/data/epiphany.schemas.in
+++ epiphany-2.29.3/data/epiphany.schemas.in
@@ -478,6 +478,17 @@
         <short>Browse with caret</short>
         </locale>
       </schema>
+      <schema>
+        <key>/schemas/apps/epiphany/web/user_agent_vendor</key>
+        <applyto>/apps/epiphany/web/user_agent_vendor</applyto>
+        <owner>epiphany</owner>
+        <type>string</type>
+        <default>GNOME.org</default>
+        <locale name="C">
+        <short>Vendor to include in the user agent</short>
+        <long>String that will be appended to the user agent, containing vendor-specific information.</long>
+        </locale>
+      </schema>
      <schema>
         <key>/schemas/apps/epiphany/general/managed_network</key>
         <applyto>/apps/epiphany/general/managed_network</applyto>
Index: epiphany-2.29.3/embed/ephy-embed-prefs.c
===================================================================
--- epiphany-2.29.3.orig/embed/ephy-embed-prefs.c
+++ epiphany-2.29.3/embed/ephy-embed-prefs.c
@@ -134,6 +134,38 @@ webkit_pref_callback_user_stylesheet (GC
 }
 
 static void
+webkit_pref_callback_user_agent_vendor (GConfClient *client,
+                                      guint cnxn_id,
+                                      GConfEntry *entry,
+                                      gpointer data)
+{
+  GConfValue *gcvalue;
+  const char *value = NULL;
+  static char *webkit_user_agent = NULL;
+  char *user_agent = NULL;
+  char *webkit_pref = data;
+
+  gcvalue = gconf_entry_get_value (entry);
+
+  /* happens on initial notify if the key doesn't exist */
+  if (gcvalue != NULL &&
+      gcvalue->type == GCONF_VALUE_STRING) {
+      value = gconf_value_get_string (gcvalue);
+  }
+
+  if (webkit_user_agent == NULL) {
+    g_object_get (G_OBJECT(settings), "user-agent", &webkit_user_agent, NULL);
+  }
+
+  user_agent = g_strconcat (webkit_user_agent, " ",
+                            "Epiphany/"VERSION, value ? " " : NULL,
+                            value, NULL);
+
+  g_object_set (settings, webkit_pref, user_agent, NULL);
+  g_free (user_agent);
+}
+
+static void
 webkit_pref_callback_font_size (GConfClient *client,
                                 guint cnxn_id,
                                 GConfEntry *entry,
@@ -231,7 +263,10 @@ static const PrefData webkit_pref_entrie
       webkit_pref_callback_boolean },
     { CONF_SECURITY_ALLOW_POPUPS,
       "javascript-can-open-windows-automatically",
-      webkit_pref_callback_boolean }
+      webkit_pref_callback_boolean },
+    { CONF_USER_AGENT_VENDOR,
+      "user-agent",
+      webkit_pref_callback_user_agent_vendor }
   };
 
 static void
Index: epiphany-2.29.3/embed/ephy-embed-prefs.h
===================================================================
--- epiphany-2.29.3.orig/embed/ephy-embed-prefs.h
+++ epiphany-2.29.3/embed/ephy-embed-prefs.h
@@ -41,6 +41,7 @@
 #define CONF_DISPLAY_SMOOTHSCROLL "/apps/epiphany/web/smooth_scroll"
 #define CONF_WEB_INSPECTOR_ENABLED "/apps/epiphany/web/inspector_enabled"
 #define CONF_CARET_BROWSING_ENABLED "/apps/epiphany/web/browse_with_caret"
+#define CONF_USER_AGENT_VENDOR "/apps/epiphany/web/user_agent_vendor"
 
 /* These are defined gnome wide now */
 #define CONF_NETWORK_PROXY_MODE "/system/proxy/mode"