firefox: add option for chrome-gnome-shell native messaging host

pkgs/applications/networking/browsers/firefox/wrapper.nix

@@ -8,7 +8,7 @@
 , google_talk_plugin, fribid, gnome3/*.gnome_shell*/
 , esteidfirefoxplugin
 , vlc_npapi
-, browserpass
+, browserpass, chrome-gnome-shell
 , libudev
 , kerberos
 }:
@@ -63,6 +63,7 @@ let
       nativeMessagingHosts =
         ([ ]
           ++ lib.optional (cfg.enableBrowserpass or false) browserpass
+          ++ lib.optional (cfg.enableGnomeExtensions or false) chrome-gnome-shell
           ++ extraNativeMessagingHosts
         );
       libs = (if ffmpegSupport then [ ffmpeg ] else with gst_all; [ gstreamer gst-plugins-base ])

pkgs/desktops/gnome-3/extensions/chrome-gnome-shell/default.nix

@@ -27,7 +27,7 @@ in stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "GNOME Shell integration for Chrome";
     longDescription = ''
-      To use the integration, install the <link xlink:href="https://wiki.gnome.org/Projects/GnomeShellIntegrationForChrome/Installation">browser extension</link>, and then set <option>services.gnome3.chrome-gnome-shell.enable</option> to <literal>true</literal>.
+      To use the integration, install the <link xlink:href="https://wiki.gnome.org/Projects/GnomeShellIntegrationForChrome/Installation">browser extension</link>, and then set <option>services.gnome3.chrome-gnome-shell.enable</option> to <literal>true</literal>. For Firefox based browsers, you will also need to build the wrappers with <option>nixpkgs.config.firefox.enableGnomeExtensions</option> set to <literal>true</literal>.
     '';
     license = licenses.gpl3;
     maintainers = gnome3.maintainers;