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Firefox has started crashing for not apparent reason since I installed Windows 10
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Sorry to hear about the crashes. If you are getting the Mozilla Crash Reporter form, your Firefox may have logged some data that would help track down the cause of the problem. 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 - asking for support" for steps to get those crash report IDs from the about:crashes page, and then post some of the recent ones here.
If you are getting freezes or "not responding" and you kill Firefox in the Task Manager, then unfortunately Firefox doesn't gather any data in that case. Perhaps something in this article might be relevant if you're facing that issue: Firefox hangs or is not responding - How to fix.
Have you tried Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions, hardware acceleration, and some advanced features of Firefox. More info: Troubleshoot Firefox issues using Safe Mode.
If Firefox is not running: Hold down the Shift key when starting Firefox.
If Firefox is running: You can restart Firefox in Safe Mode using either:
- "3-bar" menu button > "?" button > Restart with Add-ons Disabled
- Help menu > Restart with Add-ons Disabled
and OK the restart.
Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).
Any less crashy?