I think that you have to update Firefox. This crash is connected with versions 60-62 branch and there's no occurence of it above 62.

This looks like a problem with the disk cache (cache2), so maybe try to delete the Cache2 folder in the secondary location in AppData\Local. *C:\Users\<user>\AppData\Local\Mozilla\Firefox\Profiles\<profile>\ If that doesn't work then try a new profile. You can create a new profile to test if your current profile is causing the problem. See "Creating a profile": *https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles *http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems. *https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile