Been a loyal Firefox user for years. At work, I have a Mac, running MacOS 12 (now). After the most recent update of 139 (The intel iMac was running 10.15 at the time), it crashes on startup. I get a flash of the starting website (just google home page) and then crash. I thought maybe it had left the OS behind, so I upgraded to MacOS 12. No difference. Downloaded 138, installed. Works fine ... until it auto updates again, then crash again. Tried to turn off auto-update, but I can't do it fast enough before it downloads the new update, causing it to be installed on restart .. then crash again. I have solved it for the moment by using an ESR version. 128. All good again. But why is this happening, and only with the latest update? Driving me crazy.