Mozilla VPN is currently experiencing an outage. Our team is actively working to resolve the issue. Please check the status page for real-time updates. Thank you for your patience.

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.

Mozilla Support में खोजें

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

Why did firefox suddenly quit working?

  • 1 प्रत्युत्तर दें
  • 1 यह समस्या है
  • 8 views
  • के द्वारा अंतिम प्रतियुतर cor-el

more options

I have been using firefox for several weeks. Today I tried to log on and got the error message "Failed to read the configuration file. Please contact your system administrator." I tried to reload but get the same message.

I have been using firefox for several weeks. Today I tried to log on and got the error message "Failed to read the configuration file. Please contact your system administrator." I tried to reload but get the same message.

All Replies (1)

more options

Check for the presence of a mozilla.cfg file in the Firefox program folder to initialize some prefs.

This also involves the presence of a .js (JScript) file, probably in "defaults\pref" folder, that specifies to process this mozilla.cfg file.

If you have .js files apart from the channel-prefs.js file, that sets app.update.channel, in the defaults\pref folder then open this file in an editor like Notepad and please post its content.
Also please post the content of the mozilla.cfg file.

There shouldn't be a mozilla.fcg file present unless you've created it yourself to initialize some prefs.

If you have this mozilla.cfg file then best is to do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.