diff --git a/src/modules/ctypes/linux/gdk.jsm b/src/modules/ctypes/linux/gdk.jsm
index ee11087..29d5736 100644
--- a/src/modules/ctypes/linux/gdk.jsm
+++ b/src/modules/ctypes/linux/gdk.jsm
@@ -39,7 +39,7 @@
 
 var EXPORTED_SYMBOLS = [ "gdk" ];
 
-const GDK_LIBNAME = "gdk-x11-2.0";
+const GDK_LIBNAME = "gdk-3";
 const GDK_ABIS    = [ 0 ];
 
 const Cu = Components.utils;
diff --git a/src/modules/ctypes/linux/gtk.jsm b/src/modules/ctypes/linux/gtk.jsm
index fc70953..51243a5 100644
--- a/src/modules/ctypes/linux/gtk.jsm
+++ b/src/modules/ctypes/linux/gtk.jsm
@@ -2,7 +2,7 @@
 
 var EXPORTED_SYMBOLS = [ "gtk" ];
 
-const GTK_LIBNAME = "gtk-x11-2.0";
+const GTK_LIBNAME = "gtk-3";
 const GTK_ABIS    = [ 0 ];
 
 const Cu = Components.utils;
@@ -17,8 +17,8 @@ Cu.import("resource://firetray/ctypes/linux/gobject.jsm");
 Cu.import("resource://firetray/ctypes/linux/pango.jsm");
 
 function gtk_defines(lib) {
-  this.FIRETRAY_REQUIRED_GTK_MAJOR_VERSION = 2;
-  this.FIRETRAY_REQUIRED_GTK_MINOR_VERSION = 20;
+  this.FIRETRAY_REQUIRED_GTK_MAJOR_VERSION = 3;
+  this.FIRETRAY_REQUIRED_GTK_MINOR_VERSION = 0;
   this.FIRETRAY_REQUIRED_GTK_MICRO_VERSION = 0;
 
   this.GtkIconSize = ctypes.int; // enum
diff --git a/src/modules/linux/FiretrayWindow.jsm b/src/modules/linux/FiretrayWindow.jsm
index 9a6fed4..0520530 100644
--- a/src/modules/linux/FiretrayWindow.jsm
+++ b/src/modules/linux/FiretrayWindow.jsm
@@ -749,6 +749,10 @@ x11.init = function() {
 
   this.current = {};
   try {
+/* When using GTK3 (gdk.jsm, gtk.jsm) crashes with:
+(firefox:8250): GLib-GObject-WARNING **: cannot register existing type `GdkDisplayManager'
+0x00007fffd62a54b0 in gdk_display_manager_get_default_display () from /lib64/libgdk-3.so.0
+Not sure we can mix mozilla-gtk2 with firetray-gtk3... */
     let gdkDisplay = gdk.gdk_display_get_default();
     this.current.Display = gdk.gdk_x11_display_get_xdisplay(gdkDisplay);
     this.current.Atoms = {};