~chrisccoulson/firefox/firefox-trunk.autopkgtest

* firefox-gnome-support needs explicit dependency on libnotify
  - update debian/control{,.in}
* Reset the "browser" and "embed-app" content prefs after running content
  mochitests, so that the subsequent DOM browser-element tests don't
  fail
  - add d/p/test-fixes/mochitest-content-reset-permissions-when-done.patch
  - update debian/patches/series.in
* Disable Web GL conformance tests as these don't work in Xvfb
  - add d/p/test-overrides/mochitest-disable-webgl-conformance.patch
  - update debian/patches/series.in
* Disable HTML fullscreen tests, as these don't work without a window
  manager
  - add d/p/test-overrides/mochitest-disable-fullscreen-tests.patch
  - update debian/patches/series.in