Backed out changesets 448ba56d9ba4 and 8cea4b4646ef (bug 700693) for intermittent failures.
Bug 722265 - Column header selection popup no longer exposed to accessibility APIs, r=tbsaunde
Bug 828088 - Rework richgrid and richgriditem bindings to use css columns for down-then-across grids. r=fryn

--HG--
extra : rebase_source : 98eba210e74ba1d4fb56838596e50e2fba88540c
Bug 885591 - Add a silent argument to check_for_crashes. r=jhammel
Bug 885541 - Work - Move devtools icons in app bar into hamburger menu. r=fryn
Merge m-c to inbound.
Bug 874014: Revert back to icon based TabsPanel headers. [r=margaret]

--HG--
extra : rebase_source : e6410e0fec37c7386a8770fa243afda3f092eeec
Bug 885522 - Move function heavyweight info to JSScript, r=luke.
Bug 875661 - Followup: fix ggc bustage. (r=terrence)