Could not find an exact fit for this posting but this seems the best area:

Running a G4 with Firefox 3.5.7 (I think my wife recently downloaded the updated Firefox.)

Suddenly my Firefox is two two odd things. First when I save a web page I am currently visiting and return to it later, sometimes the same day often a few days latter, the web page is some ad click or ad manager address. What is odd, often I visit said web page after saving the address and it goes to the correct page for a few days, then latter it is changed to this ad stuff.

Today Firefox saved a web page address to a web page i had visited earlier in the day but was not the one I was visiting when I saved the bookmark.

Any help as this is annoying. Do I have a virus or spyware?