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"A thread at WebmasterWorld named Yahoo Sponsored Listings NOT Showing in FF? reports an issue where certain extensions conflict with the sponsored results at Yahoo! Search.  Tim Mayer from Yahoo! said, \"This could be caused by certain firefox extensions you may have installed.\"  Several people have reported this issue, one of the victims have the following extensions added to FireFox 1.0.1; Googlebar 0.9.0.30, Google Preview 0.8, Google PR Status 0.9.3, DOM Inspector 1.0."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/001668.html>