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

Facebook and Firefox does not recognise Firefox as my browser.Unable to install any add-ons from Firefox.

  • 2 replies
  • 50 have this problem
  • 2 views
  • Last reply by reiner707

more options

This all happened suddenly by itself. I did not install any new programs or software of any kind. I have Norton security software, but this has been installed on my PC for 6 months without any problems. I have uninstalled Firefox3.6,10. And reinstalled it, but it does not solve the problems.

This all happened suddenly by itself. I did not install any new programs or software of any kind. I have Norton security software, but this has been installed on my PC for 6 months without any problems. I have uninstalled Firefox3.6,10. And reinstalled it, but it does not solve the problems.

Chosen solution

The user agent string may have been modified, try resetting it as shown here - How to reset the default user agent on Firefox

Read this answer in context 👍 3

All Replies (2)

more options

Chosen Solution

The user agent string may have been modified, try resetting it as shown here - How to reset the default user agent on Firefox