Yes, commenting out the MOZ_ENABLE_WAYLAND line appears to fix the issue. With MOZ_ENABLE_WAYLAND=1, initial link requests work, but after a short while start getting the firefox is running but not responding dialog. Without it, link requests work even after a while.
** Changed in: firefox (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1921931 Title: Opening links results in "Firefox is already running, but is not responding" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1921931/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs