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.* External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2018-20/#CVE-2018-12381
Acknowledgments: Name: the Mozilla project Upstream: Jana Squires