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.

Avatar for Username

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

Natao arisiva ity resaka mitohy ity. Mametraha fanontaniana azafady raha mila fanampiana.

How do I undo upgrade to ver5.0 and go back to 4.x?

  • 1 valiny
  • 35 manana an'ity olana ity
  • 9 views
  • Valiny farany nomen'i Matt Brubeck

chrisraduazzo
chrisraduazzo
more options

I need to use a web browser compatible with Nielsen 1.0.0 add-on. New version 5.0 is not compatible so I need to revert to program as it was before the upgrade took place.

Could not find instructions in your online Help. Thank you.

I need to use a web browser compatible with Nielsen 1.0.0 add-on. New version 5.0 is not compatible so I need to revert to program as it was before the upgrade took place. Could not find instructions in your online Help. Thank you.

All Replies (1)

Matt Brubeck
Matt Brubeck
more options

Until all your add-ons are updated for Firefox 5, you can use the Add-on Compatibility Reporter to re-enable your disabled add-ons and report any problems you find with them.

Downgrading to version 4 is not recommended because several security bugs were fixed in version 5. But if you choose to downgrade anyway, you can download the Firefox 4 installer here: http://releases.mozilla.org/pub/mozilla.org/firefox/releases/4.0.1/win32/en-US/