Back out 4f2f5c15e065 (bug 652510) for regressions
Bug 1000744: re-introduce a checked state for panel-menu buttons. r=MattN, a=lsblakk

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extra : transplant_source : %0B%FE%1F%94%E8t%86tT.%DCC3%BDh%10%B7%1F%80-
Bug 966723: exit Customize Mode on menu-button click, not mouse-down. r=mconley, feedback=dao, a=lsblakk

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extra : transplant_source : %DF%9F3%C5%A4%9D%8F%1Cqo%2B%8C%93%F5%22%DE%DAMu%27
Bug 1001167 - Don't let invalid sessionstore.js files break sessionstore r=smacleod a=sylvestre
Bug 994291 - Avoid calling SimpleTest.finish more than once. r=dougt, a=test-only
Bug 1002267 - Stop trying to compare times in the mozlog unit tests. r=wlach, a=test-only
Bug 999585 - wantExportHelpers for all content-script. r=Mossop, a=sledru
Bug 966154 - Don't use __fork, it's gone in newer bionic. r=glandium, a=sledru
Merge mozilla-beta to b2g30. a=merge