Firefox 42.0

release runner failed in release sanity. Fixed by https://hg.mozilla.org/build/buildbot-configs/rev/f361af966d77
failures in linux repacks
bug 1218763 - Antivirus should retry on SSLError
A lot of AUS 503 errors.
bug 1218914 - Add win64 bouncer configs

Releases:Release Post Mortem:2015-10-27