Bug 969427 - recreating a destroyed widget after a CustomizableUI.reset() call causes the new widget to go in the customize palette, r=Gijs.

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extra : rebase_source : e9d4d232d98f3dca3602a74d97017af1418d6474
Bug 965265 - Opening a new private window shows social provider buttons which don't do anything, r=mixedpuppy.

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extra : rebase_source : 74d3f5fd7eea7c4c146f0eba843e7d39837c406f