I can't install an add-on

I'm trying to install an add-on. When I click on it I get a prompt that displays «this module requires Firefox 4.0 and you use Firefox 3.6.8»

I downloaded and installed Firefox 4.0. When I go to "About Firefox" it indicates that I use Firefox 4.0.1. However this add-on still will not install.

I've uninstalled and reinstalled Firefox 4.0 several times but nothing seems to work. I had to install and run on my laptop without problem. The laptop is running Windows 7.

This computer is running Windows Vista.

This is usually caused when an add-on is changing the user agent string (identifies the version of Firefox). To remedy this, you can reset your user agent string.

  1. Type of topic: config in the address bar and press on enter
  2. Accept the warning message that appears, you will be taken to a list of preferences
  3. Locate the general.useragent.overridepreference, right-click on it and select Reset, this function will set the default user agent string in Firefox 4

There are other user agent string settings that may have changed, but these are no longer used in Firefox 4. You can reset them if you want, for details, see https://support.mozilla.com/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser

Tags: Firefox

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