Bug 960309, make browser_tabview_bug625269.js more reliable, r=roc

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extra : rebase_source : 0a5ac4d8578ea73d1fc0d6a5c6e90651a1a4418d
Bug 960351 - browser_bug726427_csstransform_tooltip.js times out, r=pbrosset

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extra : rebase_source : e05f39f7ef4d73823bb5445b1cc398f81e560253
Bug 930793 - Remove favor performance mode, r=roc,avih

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extra : rebase_source : e936e5b02dc2e613816fb6f97f9af5a303dc6f6d