Can a site detect if I use AdBlock in Firefox?

Posted by Anders on Super User See other posts from Super User or by Anders
Published on 2010-02-03T07:47:29Z Indexed on 2010/05/05 18:38 UTC
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firefox

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firefox-addons

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adblock

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I recently visited (an official) website in search for an episode of a TV-show. The site popped an information dialog stating that I had to disable AdBlock to see the content. Is this at all possible or is it just an educated guess? Does Firefox advertise what addons I have installed? If so: how and why does it work that way?

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