Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

Search 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.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Still cannot download firefox windows vista still getting Failed to read configuration file contact your system administrator I have already dissinstalled and r

  • 3 uphendule
  • 3 zinale nkinga
  • 5 views
  • Igcine ukuphendulwa ngu markl218

more options

I have uninstalled and reinstalled firefox completly and im still getting the error mess. "Failed to read configuration file contact your system administrator. Anymore suggestions? About to give up! Thanks

I have uninstalled and reinstalled firefox completly and im still getting the error mess. "Failed to read configuration file contact your system administrator. Anymore suggestions? About to give up! Thanks

All Replies (3)

more options

Reinstalling Firefox is not likely to help. Most likely the problem is in Firefox's profile.

more options

This is likely caused by a setting to read a mozilla.cfg file in the Firefox program folder.

Do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.

  • Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.

If you keep having problems then also create a new profile.


more options

THANK YOU SOOO MUCH FOR THE HELP!! CLEANED THE REGISTRY COMPLETE UNINSTALLOF PREVIOUS COPYS OF FIREFOX DID THE TRICK!!