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Trying to install Personal Menu 4.3.2 on Firefox 3.6.3. Website is claiming I'm using Firefox 3.0.1. What should I do?

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I am running Firefox 3.6.3, and am trying to install Personal Menu 4.3.2. The Mozilla Add-Ons site is preventing me from installing, saying that the add-on is incompatible with 3.0.1.0. As this is not the version I'm using, I'm not sure what the issue is. Any thoughts?

== Attempted to install Personal Menu 4.3.2.

I am running Firefox 3.6.3, and am trying to install Personal Menu 4.3.2. The Mozilla Add-Ons site is preventing me from installing, saying that the add-on is incompatible with 3.0.1.0. As this is not the version I'm using, I'm not sure what the issue is. Any thoughts? == Attempted to install Personal Menu 4.3.2.

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Edit: have attached screenshot of FF version, in case that helps. Am fairly certain it's 3.6.3.

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Enter about:config into the location bar, click through any warning screen, then into the Filter box paste:

useragent

Right-click any entries listed in bold as "user set" -> Reset.

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Much appreciated. Thank you.