Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Søg i 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.

Læs mere

Firefox cannot start because a process is already running

  • 1 svar
  • 1 har dette problem
  • 49 visninger
  • Seneste svar af cor-el
  • Åben

Bozidar Simonovic
Bozidar Simonovic

Firefox cannot start because Mozilla process is already running and I cannot stop it.

I tried to restart my PC but no success. I reinstalled Mozilla/Firefox but again error message appears:

"Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window."

Firefox cannot start because Mozilla process is already running and I cannot stop it. I tried to restart my PC but no success. I reinstalled Mozilla/Firefox but again error message appears: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window."

Alle svar (1)

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

You can check this support article.

Stil et spørgsmål

Du skal logge ind på din konto for at svare på et indlæg. Start et nyt spørgsmål, hvis du ikke har en konto endnu.