Firefox won't open on any of the Windows 7 computers where I work after it updates to version 58. A process appears in the task managers, but nothing else happens. This doesn't seem to be quite the same issue as a few similar questions I saw. We don't have a Logitech camera and I didn't see any software or drivers for one. Also, the 64-bit version of Firefox 57 runs fine. Uninstalling and reinstalling 57 fixes Firefox. Neither the 32-bit or 64-bit 58 will open. Firefox is installed in "C:\Users\smiref\AppData\Local\Mozilla Firefox" on all our PCs due to lack of admin privileges. 58 runs fine on the one Windows 10 PC we have.