Crash Reason EXCEPTION_ACCESS_VIOLATION_READ user32.dll Suggest since you are @ version 1709 of Windows 10 you backup this to a safe place : *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data Then update Windows 10 to 1803 : *https://www.microsoft.com/en-us/software-download/windows10 If still issues : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do : *https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles *https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer Reinstall with Current Release Firefox 60.0.1 with a Full Version Installer *https://www.mozilla.org/firefox/all/ Please let us know if this solved your issue or if need further assistance.