Bug 950098 - Remove dependency on pylib, r=ahal
Bug 949501.  Make nullable unions that are isMember stop claiming to have a holder.  r=dzbarsky
Bug 951511.  If jar module shutdown happens before all the jar channels are destroyed, we still shouldn't crash.  r=bsmedberg
Bug 950336 - add a pref to disable onbeforeunload, r=bz

--HG--
extra : rebase_source : 37eaa4764a662837ae12354b9cde0e2d17a4c90d