Bug 885139 - Notify consumers about LWT optimization and listen for it in LightweightThemeListener. r=jaws a=Sylvestre
[Australis]

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extra : rebase_source : d19867e961f33c31560536efe7fc2e55d388fef5
Bug 984170 - Inherit the text colour and font-weight of OS X bookmarks on a toolbar. r=Gijs ui-r=shorlander a=Sylvestre