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.

Avatar for Username

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

Hierdie gesprek is in die argief. Vra asseblief 'n nuwe vraag as jy hulp nodig het.

Mac message "Can't open Firefox. Only one Firefox can be open at a time."

  • 1 antwoord
  • 1 het hierdie probleem
  • 1 view
  • Laaste antwoord deur cor-el

rabenson72
rabenson72
more options

We had problems completing IRS fillable forms on our Mac. After processing a major update on the Mac, we tried to open Firefox, but instead got the message "A copy of Firefox is already open. Only one Firefox can be open at time." The Firefox we are trying to open is the only one there.

We had problems completing IRS fillable forms on our Mac. After processing a major update on the Mac, we tried to open Firefox, but instead got the message "A copy of Firefox is already open. Only one Firefox can be open at time." The Firefox we are trying to open is the only one there.

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Maybe check: