Hi, Firefox = 121.0.1 64-bit Win10 = 22H2 (19045.3930) Not for the first time but the 3rd in the past few months I was closing a tab in Firefox and my PC immediately reset. No warning, just straight to blank screen as soon as I closed a tab (I had 4 open). Next thing I knew it was going through re-boot. No crash report in Firefox. This last time I had Facebook open, I had a video in Facebook popped-out, it had finished playing and I went to close the FB tab. Ian.