In Windows 7. Firefox crashed in use and now crashes on restart, every time. But only on the account I was in when it crashed. Please be clear on that --- IT WORKS IN OTHER ACCOUNTS ON THIS MACHINE. That rules out many of the suggestions I've seen for problems. It won't be a hardware problem or a driver problem if the other accounts are using the same hardware and the same drivers, and so on. It won't start in Firefox's safe mode (hold down shift while clicking on icon -- it crashes). I have since updated Firefox to version 23.0. Still works on other accounts, but not on this one. I have tried disabling addons in the other accounts, and resetting them, but resetting won't affect this account. I've run both Malwarebytes (finds nothing; in fact I run it regularly) and SuperAntiSpyware (found only tracking cookies, all of which I deleted). Looking for crash reports, there's no actual crash IDs (nothing with 'bp-' on it), even in the one called "LastCrash" which has today's date on it. In C:\Users\Glen\AppData\Roaming\Mozilla\Firefox\Crash Reports, the last 5 files with numbers in contain: 1376192937 - in the LastCrash file 1376188049 - earlier with todays date 1373320611 - from more than a month back 1369950890 - from months ago 1366156437 but just nothing with bp- in it [Please note that any suggestion that needs me to start or be running Firefox doesn't work if I can't start Firefox. In searching for information I don't know how many times I've encountered instructions that tell me to do things which assume Firefox is running. So for example the section here for "Troubleshooting information" that assumes Firefox is running is pointless when Firefox won't start. I have instead gone to another account (an Admin account) and manually grabbed troubleshooting information from there to put in -- so keep in mind that anything that relates specifically to this specific user account where I can't start Firefox from won't be there.