Bug 948092, Random failure in test_largemenu.xul, r=roc

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extra : rebase_source : 178c57b3dff9012ef9e95e379e668da4186bac6b
Bug 930793 - Remove favor performance mode, r=roc,avih

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extra : rebase_source : 5b466917ad1b1b5ef75119cfbeba75861cb49823