So, during the minute or two after opening Firefox, while Firefox is trying to restore your previous session? When Firefox crashes, it usually records information about what was happening at that moment and display the Mozilla crash reporter. You can submit that data to Mozilla and share it with forum volunteers to see whether it points to the solution. Please check the support article "[[Firefox Crashes]]" (especially the last section) for steps to get those crash IDs, and then post some of the recent ones here. If that's not possible, have you tried Firefox's Safe Mode? That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: [[Troubleshoot Firefox issues using Safe Mode]]. ''If Firefox is running:'' You can restart Firefox in Safe Mode using Help > Restart with Add-ons Disabled ''If Firefox is closed:'' Hold down the shift key when starting Firefox. In the small dialog that should eventually appear, click "Start in Safe Mode" (''not'' Reset). If Firefox works better (is more stable) in Safe Mode, we could suggest various next steps based on that information. If it's just as bad, that would be good to know as well.