Bug 950367 - random failures in test_bug462106_perwindow.xul, r=ehsan

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extra : rebase_source : 0917176511f1855f81ce92d1b030da6fcc7dce2f
Bug 950342 - Random failures in toolkit/components/places/tests/browser/browser_visituri_privatebrowsing_perwindowpb.js, r=ehsan

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extra : rebase_source : c1965dc68e125f1523ee102900afa77ed57ff922
Bug 867505 - Intermittent test_bug536567_perwindowpb.html, r=ehsan

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extra : rebase_source : eeda74ec9f14c82944e1d2797596f61880deeaca