WT??? Every Time I Hit Return, Ask.com Intrudes

I'm using Firefox

I probably need to restart the computer -- something noxious is afoot.  I'm using Firefox 2.0.0.3.

Everytime my right pinky hits [return], I'm taken to  http://www.ask.com/?o=1292

Hey Ask.com?  It may not be your fault, but it makes me hate you.