That upstream bug sounds indeed similar to the problem you're observing, but given that it's closed, it's unlikely to receive attention. Can you file a new upstream bug report and share the link to it here?
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1915498 Title: Copy / paste in Firefox randomly broken To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1915498/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
