Use-after-free while manipulating the "navigator" object within WebVR. Note: WebVR is not currently enabled by default. This vulnerability affects Firefox < 50.1.Referenceshttps://www.mozilla.org/security/advisories/mfsa2016-94/http://www.securityfocus.com/bid/94883http://www.securitytracker.com/id/1037461https://bugzilla.mozilla.org/show_bug.cgi?id=1315543
