I think I may have found a potential fix because the issue hasn't happened again since.Go into windows mouse settings and turn off "Scroll inactive windows when I hover over them"I'm not completely sure if it has fixed the problem. Just that it used ...
I've got the same problem. It shouldn't need a workaround. It needs to be fixed. I'm surprised none of the devs at Mozilla have bothered to respond about this. It's been an issue for 2 months now!
