I'm sorry, but I do not understand. Is Firefox not opening? Opening but not working? Please explain the problem in detail. What happens? What is the exact error messages? ---------------- [https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode] {web link} by holding down the '''<Shift> ''(Mac=Options)''''' key, and then starting Firefox. A small dialog should appear. Click '''Start In Safe Mode''' (not Refresh). Is the problem still there?