Bug 1077652 - tabbrowser should ignore DOMTitleChanged events from browser that have no tab assigned
Bug 1077652 - Link a preloaded <xul:browser> to a newly created tab instead of swapping docShells
Bug 1077652 - Remove old BrowserNewTabPreloader and fix tests
fix the leaks
make _createBrowser() accept options
Revert "Bug 794041 - fix test_docload.html to expect accessibles to come from people stuffing stuff in the hidden window; r=surkov"

This reverts commit 59a733eb6f0c5e31b7a1153d03f0447cd5ba3e9f.
fix a11y test
fix background capture test