Version 24.0 installed, but Version 3.5.2 appears when you try to install add-ons, how is it fixed?

I'm trying to install the add-on module, using an XP - Pro operating system. Installed originally FF before Version 3. At installation, the attempt of the States Lightbeam FF in a pop up box that I use Version 3.5.2. Currently in the help/about version says I am running version 24.0.
How can I solve this problem?

Hello MickG500, your useragent (information, the browser sends to websites to identify its version) - apparently by mistake - shows, you are on the version of firefox 3.5.2. Please refer to this article to reset the settings of the user agent in firefox: websites say that Firefox is obsolete or incompatible, even if it's the latest version

Tags: Firefox

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