Bug 794041 - fix test_docload.html to expect accessibles to come from people stuffing stuff in the hidden window; r=surkov
Bug 791670 - part 1 - flip the browser.newtab.preload pref; r=jaws
Bug 791670 - part 2 - fix browser_bug763468_perwindowpb.js test; r=ehsan
Bug 791670 - part 3 - fix newtab page tests; r=jaws