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How to check with Javascript if a Firefox 3 Add-onExtension is installed - Stack Overflow

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Actually this question is based on a Blog Entry, which discusses the topic for FF2. But how does this work with FireFox 3?

I know that there must be a workaround, because recently I visited a site saying: "Please disable AdBlock+ before entering this site" :(

Actually this question is based on a Blog Entry, which discusses the topic for FF2. But how does this work with FireFox 3?

I know that there must be a workaround, because recently I visited a site saying: "Please disable AdBlock+ before entering this site" :(

Share Improve this question edited Feb 6, 2012 at 0:42 Alicja Kario 23k4 gold badges29 silver badges45 bronze badges asked Feb 20, 2009 at 20:22 Federico EllesFederico Elles 8913 gold badges14 silver badges24 bronze badges
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There's no general-purpose way to do that, for security reasons. Even the FF2 version mentioned there was specific to that particular extension -- you can't assume identically-named and -placed icons for all extensions.

The AdBlock-spotters, as Stephen presumed, tend to be behavior-based and specific to that extension. Likewise Greasemonkey-spotters, etc.

Please see this url. http://www.guyfromchennai./?p=104 This is worked for me

There are other ways they could be detecting AdBlock+. It could tell that you never loaded the ad with some server side code and assume you're using it, maybe?

Or if the ad is flashed based, javascript could try to municate with it first.

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