Bug 859591 - 'Aborted transactions sometimes block all remaining transactions forever'. r=khuey.
Bug 859858 - Fix for intermittent browser_bug664688_sandbox_update_after_navigation.js | Timed out while waiting for: window.location.href result is displayed after goBack(), browser_repeated_messages_accuracy.js | Timed out while waiting for: messages displayed; r=past
bug 856458 - Fixup metro mochitests r=mbrubeck,jimm

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extra : rebase_source : e42ab8c875d658b96a2795fb1a5316ba29922f23
Backed out changeset 9b9a5c42fb46 (bug 859601) for bustage on a CLOSED TREE.