Bug 835002 - Add back Growl support for TB19/20/21 and SM 2.16/2.17/2.18.
Merge changes from beta
Bug 834721 - Use plurals for toolbox button tooltip
Bug 765398 - Add a "yes, I allow tracking" option to DNT.
Bug 817477 - Remove support for global private browsing mode
Bug 835892 - Provide No Video & No Audio options when both camera and microphone access are requested.
Bug 822371 - Mixed Content Doorhanger UI.
Bug 836010 - When startup is determined to be slow, tell users about ways to improve their startup time.
Bug 837027 - Fix social UI for a multi-provider world.
Bug 824785 - social toolbar buttons should have an aria-label.
Bug 831921 - Make the plugin UI less broken-looking for all plugins except for crashed plugins
Bug 817477 - Remove support for global private browsing mode - part II
Bug 828987 - The Variables View should be keyboard accessible
Bug 831794 - Variables View: allow users to override getter properties to plain value properties
Bug 824243 - Make Profiler UI localizable
Bug 781573 - Implement the step attribute for <input type=time>
Bug 700061 - Entirely remove the Style Inspector unmatched selectors
Bug 789785 - [inspector] Change wording of "Only user styles" checkbox
Bug 830668 - Add a keyboard shortcut for the Profiler
Bug 838164 - Add a pretty headers to late write stacks.