A potentially exploitable use-after-free crash during actor destruction with service workers. This issue does not affect releases earlier than Firefox 49. This vulnerability affects Firefox < 49.0.2.Referenceshttps://www.mozilla.org/security/advisories/mfsa2016-87/http://www.securityfocus.com/bid/93811http://www.securitytracker.com/id/1037077https://bugzilla.mozilla.org/show_bug.cgi?id=1309823
