Bug 749894: performance.now() mochitest3: Better spec compliance, stricter test, better slack. r=bz
Bug 684887 part A - Make the XPCOM component manager non-reentrant, and make sure that nsFactoryEntry.mFactory is protected by it, r=cjones

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extra : rebase_source : f6a458a98c53f8a7490bc621095029e9446d4775
Bug 684887 part B - make a SafeMutex which should crash if you try to recursively lock it, instead of deadlocking. r=bent

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extra : rebase_source : 694c5cd571e5802ce5e5af4ea03b9edc7e6fb8d4