Bug 1046941 - Disable downloads and extension installs in guest mode. r=margaret
Bug 1052254 - Disable loading of file URLs in guest sessions. r=rnewman
Bug 1048000 - Expect undefined for non-matching regex groups. r=bnicholson
Bug 1046493 - Enable video casting during tests. r=gbrown
Bug 1042194 - Add a framework for adding widgets to error pages. r=margaret