Add German translation
Merge pull request #290 from synapsos/locale-de

Add German translation
Upgrade to Firefox 35.0 beta 1
Fix search field look (#286)
Fix locales
Return hidden key for "Tabs on top" tweak (#283)
Fix #TabsToolbar's bottom border (#37)
Add "Disable the underline on e10s tabs" tweak
Fix selected tab's borders in private windows
Add "Bold tab label" tweak