Updated to Mac OS 11.3.1 & Firefox 88.0.1 and now Firefox is crashing everytime the screensaver takes over.
MacBook Pro (13", 2020, 4 Thunderbolt 3 ports), 2.3GHz Quad-core Intel Core I7, 32G RAM, Intel Iris Plus Graphics 1536Mb
Puzzled. It's been crashing all day ever since the update. Have to reboot Firefox every time.