Upgrade to Firefox 33.0a2 (26-Jul-2014 10:26)
Upgrade to Firefox 34.0a1 (26-Jul-2014 11:47)
Remove link to gnome-theme-tweak repo

Because sources of GNOME Theme Tweak extension in this repo now (`/extension/`).
Merge remote-tracking branch 'upstream/master'

Conflicts:
	README.md
	theme/shared/browser/newtab/newTab.css