We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Caută ajutor

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.

Află mai multe

Acest fir de discuție a fost arhivat. Adresează o întrebare nouă dacă ai nevoie de ajutor.

Can't Open Browser

  • 3 răspunsuri
  • 0 au această problemă
  • 2 vizualizări
  • Ultimul răspuns de cor-el

more options

This problem started yesterday. Right after turning on the computer (Windows 10), if I try to start Firefox (or other browsers based on it), I get a message saying "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." Of course, since I just started the computer, no old process is running. I've looked in Resource Monitor and Task Manager to be sure. If I click on "Close Firefox" I just get the same message again. I installed the latest version of Firefox. I deleted one of the other browsers and reinstalled it. I've tried doing a clean boot. Nothing helps. Meanwhile, I can still open browsers not based on Mozilla.

This problem started yesterday. Right after turning on the computer (Windows 10), if I try to start Firefox (or other browsers based on it), I get a message saying "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." Of course, since I just started the computer, no old process is running. I've looked in Resource Monitor and Task Manager to be sure. If I click on "Close Firefox" I just get the same message again. I installed the latest version of Firefox. I deleted one of the other browsers and reinstalled it. I've tried doing a clean boot. Nothing helps. Meanwhile, I can still open browsers not based on Mozilla.

Toate răspunsurile (3)

more options
more options

Deleting the parent.lock file worked on two out of three browsers. Oddly not on the one I reinstalled. I'll try deleting and reinstalling it again.

more options

You can create a new profile as a quick test to see if your current profile is causing the problem.

See "Creating a profile":

If the new profile works, you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.