Firefox Community Forum

When I try to open Firefox, I get a box saying it is open, and I must close it. I do so, and a new Firefox pops up. However when I try to close that, it won't do so.

I keep getting the Firefox download page instead of the Firefox browser on my Windows 11 computer, even though I downloaded it several times after it was accidentally knocked off by some other program. How can I get it back to the Firefox browser?

Thanks so much~ dorcas

I can't open Firefox. I keep getting the message "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.". I can't find it to close. I tried uninstalling it, but I keep circling back to the same message. I tried refreshing it and again same message. I un installled Surfshark VPN, I ran Windows Defender antivirus. I am now out of ideas. I do have two profiles, but the message about deleting them is scary. I don't want to do anything until I understand what I am doing.

Windows 11; all updates are installed, Dell computer purchased in October, with AMD processor.

I have tried all suggestions from the "Firefox is already running..." page but could not fix the problem.

I don't know if this is a problem, but I have several profile folders (see image). The top one is empty, but two folders below that one, are 2 GB or more in size.

Should I delete some or any of them?

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."

My iMac automatically updated to the latest version of Firefox and now Firefox won't open at all. I keep getting an error message about installing a helper tool. I tried both installing the Helper Tool and canceling (see attached image) with no success. Please advise.

Thanks! Carol Boehler cboehler2@unl.edu

I reinstalled it many times. I also force-quit the process in Task Manager. Basically, I did everything Google told me to do. But everything was the same. It says: Firefox is already running but is not responding. To open a new window, the running Firefox process must be terminated. please help

Nachdem ich Mozilla VPN heruntergeladen und installiert hatte, stürzte mein Firefox Browser regelmäßig beim Start ab, so das ich Mozilla VPN wieder deinstallieren musste um überhaupt wieder in Firefox zu gelangen ?????

Gruss Robert