Bug 889614 - Fix regression in plugin reparenting. r=josh
Bug 889614 - Fix and cleanup plugin re-parenting tests to catch this in the future. r=josh
Bug 889614 - Fix test_object display:none checking issues found while testing. r=josh
Bug 891993: Mark toolkit/components/downloads/ as FAIL_ON_WARNINGS (re-landing after backout). r=mak