Firefox Monitor page is at https://monitor.firefox.com/

https://blog.mozilla.org/blog/2018/09/25/introducing-firefox-monitor-helping-people-take-control-after-a-data-breach/

Though the herokuapp page appears to be from Mozilla. examples mentions of the link: https://github.com/mozilla/blurts-server/issues/710 https://github.com/mozilla/fxa-bugzilla-mirror/issues/577

At or around 10:10 AM Pacific Time I was at usatoday.com or cnn.com when a page popped up on my screen asking me to take a survey for Firefox. I tried to navigate back to the previous page, but my browser wouldn't respond. I had to press Ctrl+Alt+Delete to get into Task Manager to kill Firefox, followed by a virus scan and a deep disk clean. I can't imagine Mozilla making it difficult for users to back out of a survey, so I'm wondering if the web page where it happened was infected with a browser redirect or something.