googleads.g.doubleclick.net & Firefox & Yahoo....?

Okay, so I'm at yahoo.com and I search for, say, elephants (or anything else!).
The search runs, but the top 5 links are to googleads.g.doubleclick.net, and then some long string after that. It only does this w/ Firefox, not with IE. The IE yahoo search works fine.
What is wrong???? Possible virus? I ran a virus sweep, even reinstalled Firefox, and nothing changes.
 
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