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

Avatar for Username

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

Firefox cannot start because a process is already running

  • 1 (رد واحد)
  • 1 has this problem
  • 63 views
  • آخر ردّ كتبه cor-el
  • Open

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."

All Replies (1)

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

You can check this support article.

اطرح سؤالا

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.