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diff -up firefox-48.0/modules/libpref/init/all.js.orig firefox-48.0/modules/libpref/init/all.js
--- firefox-48.0/modules/libpref/init/all.js.orig 2016-07-25 22:22:05.000000000 +0200
+++ firefox-48.0/modules/libpref/init/all.js 2016-07-28 13:14:39.065888837 +0200
@@ -4497,6 +4497,7 @@ pref("gfx.apitrace.enabled",false);
pref("gfx.content.use-native-pushlayer", true);
#ifdef MOZ_WIDGET_GTK
pref("gfx.xrender.enabled",false);
+pref("widget.allow-gtk-dark-theme", false);
#endif
#endif
diff -up firefox-48.0/widget/gtk/nsLookAndFeel.cpp.orig firefox-48.0/widget/gtk/nsLookAndFeel.cpp
--- firefox-48.0/widget/gtk/nsLookAndFeel.cpp.orig 2016-06-01 06:11:44.000000000 +0200
+++ firefox-48.0/widget/gtk/nsLookAndFeel.cpp 2016-07-28 13:58:35.645067880 +0200
@@ -28,6 +28,7 @@
#include <dlfcn.h>
#include "mozilla/gfx/2D.h"
+#include "mozilla/Preferences.h"
#if MOZ_WIDGET_GTK != 2
#include <cairo-gobject.h>
@@ -1097,16 +1098,22 @@ nsLookAndFeel::Init()
// with wrong color theme, see Bug 972382
GtkSettings *settings = gtk_settings_get_for_screen(gdk_screen_get_default());
- // Disable dark theme because it interacts poorly with widget styling in
- // web content (see bug 1216658).
- // To avoid triggering reload of theme settings unnecessarily, only set the
- // setting when necessary.
- const gchar* dark_setting = "gtk-application-prefer-dark-theme";
- gboolean dark;
- g_object_get(settings, dark_setting, &dark, nullptr);
- if (dark) {
- g_object_set(settings, dark_setting, FALSE, nullptr);
+ bool isContentProcess = XRE_IsContentProcess();
+ bool allowDarkTheme = mozilla::Preferences::GetBool("widget.allow-gtk-dark-theme", false);
+
+ if (isContentProcess || !allowDarkTheme) {
+ // Disable dark theme because it interacts poorly with widget styling in
+ // web content (see bug 1216658).
+ // To avoid triggering reload of theme settings unnecessarily, only set the
+ // setting when necessary.
+ const gchar* dark_setting = "gtk-application-prefer-dark-theme";
+ gboolean dark;
+ g_object_get(settings, dark_setting, &dark, nullptr);
+
+ if (dark) {
+ g_object_set(settings, dark_setting, FALSE, nullptr);
+ }
}
GtkWidgetPath *path = gtk_widget_path_new();
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