Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox will not open - it says it has a copy open already - and it does not. This happened after I tried to update to new firefox.

  • 2 cavab
  • 2 have this problem
  • 5 views
  • Last reply by cor-el

more options

I attempted to upload the new version of Firefox. When I did this - I could not open Firefox at all - a box pops up telling me to 'Close Firefox - a copy of firefox is already open - Only one copy of Firefox can be open at a time.

I tried to remove Firefox completely form the computer and reinstall - and I get the same message.

I am using a macbook prop with Lion operating system

I attempted to upload the new version of Firefox. When I did this - I could not open Firefox at all - a box pops up telling me to '''Close Firefox - a copy of firefox is already open - Only one copy of Firefox can be open at a time.'' I tried to remove Firefox completely form the computer and reinstall - and I get the same message. I am using a macbook prop with Lion operating system

All Replies (2)

more options

Must be the "hang at exit" problem. You already know how to do Step1; now just determine which Add-on (Extension or Plugin) is causing the problem.

  1. Stop the Firefox process:
  2. Why Firefox may hang:
  3. Use Firefox Safe Mode to find a problem with an Extension or Plugin:


If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.

more options