I dont know what to tell you either. I hate "It works for me" as the end of troubleshooting. But whether you can replicate the issue on other systems is valid

I dont know what to tell you either. I hate "It works for me" as the end of troubleshooting. But whether you can replicate the issue on other systems is valid diagnostic information. It could legitimately still be a firefox bug, one that relates to your system in particular. But I have no way to tell from over here.