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How do I make sure that all Firefox sessions are closed so I can download 6.0? Keep getting a dialogue box saying that only 1 can be open at a time. Only 1 IS open, and I need this update to meet a system requirement for an online class.

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New Contributor

How do I make sure that all Firefox sessions are closed so I can download 6.0? Keep getting a dialogue box saying that only 1 can be open at a time. Only 1 IS open, and I need this update to meet a system requirement for an online class.

Not sure what I can add to that. I actually shut down my Mac to make sure no sessions were open before I tried again. Help.

4 REPLIES
Regular Contributor

Re: How do I make sure that all Firefox sessions are closed so I can download 6.0? Keep getting a dialogue box saying that only 1 can be open at a time. Only 1 IS open, and I need this update to meet a system requirement for an online class.

Why don't you download Firefox 6.0 as a installation pack and then install it. You can do it here:

Download Firefox All systems/ Languages


Firefox installation will do the housekeeping for you!


Don't forget to hit 'Solved it' Button if you found this helpful so you close the topic.

New Contributor

Re: How do I make sure that all Firefox sessions are closed so I can download 6.0? Keep getting a dialogue box saying that only 1 can be open at a time. Only 1 IS open, and I need this update to meet a system requirement for an online class.

Same result: A copy of Firefox is already open. Only one copy of Firefox can be open at a time.

Regular Contributor

Re: How do I make sure that all Firefox sessions are closed so I can download 6.0? Keep getting a dialogue box saying that only 1 can be open at a time. Only 1 IS open, and I need this update to meet a system requirement for an online class.

Try closing the program with something like a task manager. If that didn't do the trick, try to uninstall the last version. Then install the pack. If you can't download FF new versions, try to use other browsers like Safari as you're using MAC OS and download the pack and install a clean version.

Shooting Star Contributor

Re: How do I make sure that all Firefox sessions are closed so I can download 6.0? Keep getting a dialogue box saying that only 1 can be open at a time. Only 1 IS open, and I need this update to meet a system requirement for an online class.

Must be the "hang at exit" 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:


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