Bug 1105520 - Open Loop room conversation window right after it's created. r=mikedeboer
Bug 1073125 -  Run trimage on all new_tablet image assets (r=mcomella)
Bug 980231 followup: speed up browser_lastAccessedTab.js
Bug 1054739 - Normalize language tags when setting the Accept-Language header. r=gerv,mcmanus
Bug 1105579 - increase browser_lastAccessedTab.js error tolerance, DONTBUILD
Merge mozilla-central to fx-team
Bug 1097121 - Animate items being removed from the tabs panel grid (r=lucasr)
Bug 1100897 - Avoid duplicate RESTORED tab event on startup (r=mhaigh)
Bug 1055604 - Add animation to reveal tabs on startup (r=mcomella)
Bug 1100894 - Don't smooth scroll when restoring tabs on startup (r=mcomella)
Bug 1074667: Generate system alert when someone joins a room. r=MattN
Merge f-t to m-c, a=merge