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.

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

Every time I try to start Firefox I get"A copy of FF is already open. Only one can be opened at a time" How o I get FF to work?

  • 1 پاسخ
  • 4 have this problem
  • 3 views
  • آخرین پاسخ توسّط TonyE

more options

I can't get Firefox to start up. I've downloaded a new copy several times and keep getting the error message, "A copy of Firefox is already open. Only one copy of Firefox can be open at a time". I do not have Firefox running anywhere.

I can't get Firefox to start up. I've downloaded a new copy several times and keep getting the error message, "A copy of Firefox is already open. Only one copy of Firefox can be open at a time". I do not have Firefox running anywhere.

All Replies (1)

more options

See "Firefox is already running but is not responding" error - How to fix, the image shown in that article is the Windows equivalent of the error message that you are receiving, but the information relates to the Mac.