Issue solved. It's caused by the "10ten" Japanese translation addition, when the "highlight matched text" setting is enabled.
Now, why that causes this issue I don't know, but I will report it to the developer so they are aware of it. Olivier, thanks for taking the time to look at this! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1948355 Title: Firefox settings font size dropdown flashes, hard to select To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1948355/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
