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Why is it that Firefox cannot connect to any web site with googlesdservices in the url?

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Error Message: "Unable to connect Firefox can't establish a connection to the server at www.googleadservices.com."

Chrome works fine.

Error Message: "Unable to connect Firefox can't establish a connection to the server at www.googleadservices.com." Chrome works fine.
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Would it be silly to suggest that maybe Adblock Plus or another content-filtering extension might be blocking that site? If you have an ABP button on the toolbar, see whether it has an option to create an exception for the site and then reload to see whether that makes any difference.