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When visiting sites (including Firefox's help page!) I am seeing double underlined links in green type randomly throughout website pages that link to a Groupon subscriber site. Is my machine compromised, or is it just Firefox 5.0?

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I am using Firefox 5.0

I am using Firefox 5.0

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You can block both intelliTXT and Google Ad-Sense with a hosts file and with Adblock Plus.

Having a good hosts file on your system can protect your entire system cross-application and all browsers and all your Firefox profiles against a lot malware. The hosts file must coded for www.example.com, example.com, anything.example.com -- Adblock Plus is more generic and can do more with less coding -- subscribe to the EasyList US filters as ADP will do nothing without filters. See links below.

More information: on extensions and keyword shortcuts

Terminology:

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Thanks so much! That did the trick! What a bunch of creepers these ad folks are!

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Would you please mark as solved, so it doesn't remain as unsolved. Thanks.