Hi, Did the update leave a text folder on your desktop with a list of programs it took out ? Sometimes it does. Ok well lets get a copy of your Profile folder for safe keeping if it is still there *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data Now lets do a clean install : 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. Reinstall with Current Release Firefox 60.0.2 with a Full Version Installer *https://www.mozilla.org/firefox/all/ Always to be done : *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 Please let us know if this solved your issue or if need further assistance.