After further testing it's not a Firefox problem, other applications have the same issue. Weirdly, gnome-shell itself doesn't have the issue, hence my initial mistake. Gnome terminal, thunderbird, and Ubuntu software all have the same symptoms.
Note that mouse input works fine. Reaffecting to gnome-shell as it seems to be a problem there? ** Package changed: firefox (Ubuntu) => gnome-shell (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1940657 Title: Cannot type in address bar nor page content in live session To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1940657/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
