See it in action https://youtu.be/C38e89xqxs0
Try it yourself
- Visit https://fulldecent.github.io/you-cant-leave-this-page-2/
- Try to go back
Affected browsers
Firefox 129.0.1 64-bit on macOS and possibly more.
Bugzilla report
https://bugzilla.mozilla.org/show_bug.cgi?id=1913514
X discussion
https://x.com/fulldecent/status/1824510778520526923
Video walkthrough
https://www.youtube.com/watch?v=C38e89xqxs0
Blog
https://blog.phor.net/firefox-zero-day-cant-leave-this-page-2