diff --git a/firefox-redhat-default-prefs.js b/firefox-redhat-default-prefs.js
index e4a7223..d027bd8 100644
--- a/firefox-redhat-default-prefs.js
+++ b/firefox-redhat-default-prefs.js
@@ -24,3 +24,5 @@ pref("media.gmp-gmpopenh264.autoupdate",false);
 pref("media.gmp-gmpopenh264.enabled",false);
 pref("media.gmp-gmpopenh264.enabled",false);
 pref("plugins.notifyMissingFlash", false);
+/* See https://bugzilla.redhat.com/show_bug.cgi?id=1226489 */
+pref("browser.display.use_system_colors", false);
diff --git a/firefox.spec b/firefox.spec
index 6a977b3..1a3c639 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -107,7 +107,7 @@
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        38.0.5
-Release:        1%{?pre_tag}%{?dist}
+Release:        2%{?pre_tag}%{?dist}
 URL:            http://www.mozilla.org/projects/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
@@ -814,6 +814,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Fri Jun 5 2015 Martin Stransky <stransky@redhat.com> - 38.0.5-2
+- Disabled system colors by default (rhbz#1226489)
+
 * Wed Jun  3 2015 Jan Horak <jhorak@redhat.com> - 38.0.5-1
 - Update to 38.0.5