Bug 847593 - Remove tab-browser
Stop creating loaders than are never unloaded.
Merge pull request #1329 from Gozala/bug/test-runner@787390

Bug 787390 - Stop creating loaders than are never unloaded. r=@jsantell
Implement toolbar API.
Merge pull request #1307 from Gozala/bug/toolbar@787390

Bug 787390 - Toolbar & Frame API implementations. r=@ZER0
Merge pull request #1328 from erikvold/847593

Bug 847593 - Remove tab-browser r=@gozala
Bug 951317 - Split Button API in ActionButton and ToggleButton