Bug 1042239 creating a promise which resolves when the system has started r=Mossop
Bug 1051066 - fix mochitest-chrome for single test runs, r=ted

--HG--
extra : rebase_source : 85ddaf183d33014d86b5659db10871b9ae2abc94
Bug 1048664 - Fallback to /favicon.ico if an imageDocument is too large to use as a tab icon. r=dao ui-r=phlsa
Merge fx-team to m-c. a=merge