Move all logic to include/Tweaks.js
Move default prefs list to include/DefaultPrefs.js
Add basic Ubuntu Firefox Modifications extension support (#229)
Fix borders color of #urlbar
Add [forwardshowalways] attribute (for Tweaks extension)
Add box-shadow for toobarbuttons in :hover state
Merge branch 'master' into ux
Adopt `7443375` commit for Fx 29+
Adopt `1d79bb5` commit for Fx 29+