This is a problem I've had for a while and thought it would be eventually fixed, but no luck so far. TL;DR - Almost every time I add or remove monitors my Firefox hangs. More context: I use a PC laptop and constantly switch from using just the laptop screen to using just a set of two monitors, with the laptop closed. What I do is, I lock my machine, with Firefox open on the laptop screen, connect the monitors, close the laptop lid, and unlock the machine. That causes Firefox to hang and I'm forced to kill it and open it back again. It usually reopens all tabs without a problem but the issue is pretty annoying. My current version is 125.0.2 and I'm sure the problem dates from several versions