Manually dragging and dropping an Outlook email message into the browser will trigger a page navigation when the message's mail columns are incorrectly interpreted as a URL. *Note: this issue only affects Windows operating systems with Outlook installed. Other operating systems are not affected.*. This vulnerability affects Firefox ESR < 60.2 and Firefox < 62.
https://www.mozilla.org/security/advisories/mfsa2018-21/
https://www.mozilla.org/security/advisories/mfsa2018-20/
https://security.gentoo.org/glsa/201810-01
https://bugzilla.mozilla.org/show_bug.cgi?id=1435319