Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

ابحث في الدعم

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

Widespread "Firefox is already running" problem suggests it is not closing properly - is Mozilla fixing this?

  • 1 (رد واحد)
  • 12 have this problem
  • 6 views
  • آخر ردّ كتبه David McRitchie

more options

Several people including me have reported a problem when closing Firefox and then attempting to re-open it. The message "FF is already running and must be closed...." appears, yet the taskbar does not show an active FF. At that point it is necessary to use Task Manager to close the old run. 1. This did not always happen on my computer- has started recently. 2. Most of the time it is in fact possible to open multiple versions of FF without difficulty. This problem only seems to happen if I close the first session and then immediately try to open a new one. So my question is what causes this, not what workaround can to used when it occurs.

Several people including me have reported a problem when closing Firefox and then attempting to re-open it. The message "FF is already running and must be closed...." appears, yet the taskbar does not show an active FF. At that point it is necessary to use Task Manager to close the old run. 1. This did not always happen on my computer- has started recently. 2. Most of the time it is in fact possible to open multiple versions of FF without difficulty. This problem only seems to happen if I close the first session and then immediately try to open a new one. So my question is what causes this, not what workaround can to used when it occurs.

الحل المُختار

1- Both of those problems(ending Firefox and restarting) are answered in

http://dmcritchie.mvps.org/firefox/firefox-problems.htm#close_firefox

2- Multiple versions of Firefox requires you to use -no-remote on your non default browser/profile combination. Which can't be by accident so either you messed up in start parameters or you never did have multiple versions of firefox running at the same time.


Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.

Read this answer in context 👍 0

All Replies (1)

more options

الحل المُختار

1- Both of those problems(ending Firefox and restarting) are answered in

http://dmcritchie.mvps.org/firefox/firefox-problems.htm#close_firefox

2- Multiple versions of Firefox requires you to use -no-remote on your non default browser/profile combination. Which can't be by accident so either you messed up in start parameters or you never did have multiple versions of firefox running at the same time.


Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.