Bug 824224 - IndexedDB blobs crash with 'ABORT: NULL actor value passed to non-nullable param.' r=cjones.

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extra : transplant_source : %FC%7F%83%B1%BCW%40%90%19M%96%18y%19%7B%A0%DE%E51h
Bug 813758 - Need additional security checks for the geolocation permission. r=sicking,jdm a=blocking-basecamp
Bug 787285 - Enhance the presence of the stop/resume/open buttons in the downloads views.
r=mak
Bug 812255 - Add @2x icons for download items.
r=mak