diff --git a/MozillaFirefox.changes b/MozillaFirefox.changes
index f9fe8987..563541f2 100644
--- a/MozillaFirefox.changes
+++ b/MozillaFirefox.changes
@@ -280,6 +280,11 @@ Fri Feb 15 13:45:57 UTC 2019 - Guillaume GARDET <guillaume.gardet@opensuse.org>
 
 - Update _constraints to avoid 'no space left' error seen on aarch64
 
+-------------------------------------------------------------------
+Thu Feb 14 08:19:19 UTC 2019 - Martin Liška <mliska@suse.cz>
+
+- Enable PGO for x86_64.
+
 -------------------------------------------------------------------
 Wed Feb 13 07:17:28 UTC 2019 - Wolfgang Rosenauer <wr@rosenauer.org>
 
diff --git a/MozillaFirefox.spec b/MozillaFirefox.spec
index 4dcee0e7..41fd9759 100644
--- a/MozillaFirefox.spec
+++ b/MozillaFirefox.spec
@@ -62,6 +62,7 @@ BuildRequires:  Mesa-devel
 BuildRequires:  alsa-devel
 BuildRequires:  autoconf213
 BuildRequires:  dbus-1-glib-devel
+BuildRequires:  dejavu-fonts
 BuildRequires:  fdupes
 BuildRequires:  memory-constraints
 %if 0%{?suse_version} <= 1320
@@ -90,6 +91,7 @@ BuildRequires:  startup-notification-devel
 BuildRequires:  unzip
 BuildRequires:  update-desktop-files
 BuildRequires:  xorg-x11-libXt-devel
+BuildRequires:  xvfb-run
 BuildRequires:  yasm
 BuildRequires:  zip
 %if 0%{?suse_version} < 1550
@@ -168,6 +170,7 @@ Patch12:        mozilla-disable-wasm-emulate-arm-unaligned-fp-access.patch
 # Firefox/browser
 Patch101:       firefox-kde.patch
 Patch102:       firefox-branded-icons.patch
+Patch103:       firefox-add-kde.js-in-order-to-survive-PGO-build.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 Requires(post):   coreutils shared-mime-info desktop-file-utils
 Requires(postun): shared-mime-info desktop-file-utils
@@ -276,6 +279,7 @@ cd $RPM_BUILD_DIR/%{source_prefix}
 # Firefox
 %patch101 -p1
 %patch102 -p1
+%patch103 -p1
 
 %build
 # no need to add build time to binaries
@@ -388,10 +392,11 @@ ac_add_options --disable-webrtc
 # LTO needs newer toolchain stack only (at least GCC 8.2.1 (r268506)
 %if 0%{?suse_version} > 1500
 ac_add_options --enable-lto
+ac_add_options MOZ_PGO=1
 %endif
 %endif
 EOF
-./mach build
+xvfb-run --server-args="-screen 0 1920x1080x24" ./mach build
 
 %install
 cd $RPM_BUILD_DIR/obj
diff --git a/firefox-add-kde.js-in-order-to-survive-PGO-build.patch b/firefox-add-kde.js-in-order-to-survive-PGO-build.patch
new file mode 100644
index 00000000..7e66b01b
--- /dev/null
+++ b/firefox-add-kde.js-in-order-to-survive-PGO-build.patch
@@ -0,0 +1,34 @@
+From 89767f5dd97e69d7e9189e5603647645818d27d6 Mon Sep 17 00:00:00 2001
+From: marxin <mliska@suse.cz>
+Date: Thu, 29 Nov 2018 10:07:29 +0100
+Subject: [PATCH 2/3] Add kde.js in order to survive PGO build.
+
+---
+ browser/app/Makefile.in | 1 +
+ kde.js                  | 2 ++
+ 2 files changed, 3 insertions(+)
+ create mode 100644 kde.js
+
+diff --git a/browser/app/Makefile.in b/browser/app/Makefile.in
+index 4129aa43fb91..c9950895d520 100644
+--- a/browser/app/Makefile.in
++++ b/browser/app/Makefile.in
+@@ -57,6 +57,7 @@ endif
+ libs:: $(srcdir)/profile/channel-prefs.js
+ 	$(NSINSTALL) -D $(DIST)/bin/defaults/pref
+ 	$(call py_action,preprocessor,-Fsubstitution $(PREF_PPFLAGS) $(ACDEFINES) $^ -o $(DIST)/bin/defaults/pref/channel-prefs.js)
++	cp $(topsrcdir)/kde.js $(DIST)/bin/defaults/pref/kde.js
+ 
+ ifeq (cocoa,$(MOZ_WIDGET_TOOLKIT))
+ 
+diff --git a/kde.js b/kde.js
+new file mode 100644
+index 000000000000..b0d3e5d20437
+--- /dev/null
++++ b/kde.js
+@@ -0,0 +1,2 @@
++pref("browser.preferences.instantApply", false);
++pref("browser.backspace_action", 0);
+-- 
+2.19.1
+