I can't download a theme because the download button is grey

I can't download a theme for Firefox. The Download button is gray and when I click it a drop down menu appears:"To install this add-on and thousands more, get Firefox, a free and open web browser from Mozilla. Learn more about Firefox or download anyway." Even though I have Firefox.

Your UserAgent string in Firefox is messed up by another program that you installed, and the addons website doesn't know which version of Firefox you are using.
[http://en.wikipedia.org/wiki/User_Agent]
type '''about:config''' in the URL bar and hit Enter
''If you see the warning, you can confirm that you want to access that page.''
Filter = '''general.useragent.'''
Right-click the preferences that are '''bold''', one line at a time, and select '''''Reset''''',
Then restart Firefox

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