Bug 841980 - Lazy load calendar dom nodes.
Bug 842627 - On cold app launch, wait for the app to be loaded and
painted before screenshoting.
r=vingtetun
Merge pull request #8192 from etiennesegonzac/wm-level-optims

Bug 842627 - On cold app launch, wait for the app to be loaded and painted before screenshoting.
Bug 839454 - Backout since this is not the cause of the regression. r=me
Merge pull request #8193 from vingtetun/839454

Bug 839454 - Backout since this is not the cause of the regression. r=me
Merge pull request #8147 from KevinGrandon/bug_816610_startup_improvements

Bug 841980 - Lazy load calendar dom nodes. r=vivien