Here is the current situation. Firefox is consistently crashing in Windows 11, either a tab crash or the application itself. I'm not sure how to resolve it at this point. It was sufficiently bad that at first I assumed this was a problem with my Windows 11 installation, and did a complete reinstall of the OS followed by a fresh install of Firefox. That did not resolve the problem. Firefox is still crashing. I completely replaced the SSD assuming there was some kind of read/write problem between it and Firefox, did a clean install of Win11 and Firefox, and instead of porting my profile ported only my bookmarks and passwords into a new profile. It's still happening. I don't know what to do at this point.