Merge pull request #19492 from jrburke/bug1010867-email-slow-down-there-buddy

Bug 1010867 - [OPENC_1.3][email/UI] Message notification handling is pushing message_reader onto the stack twice r=asuth
Merge branch 'v1.3' into v1.3t
Bug 1017243: disguise camera slowness

address review comment and fix tests