Uhm - the “I use KDE Ctl-F2” was a clue that a “virus” was likely not his problem. He’s using Linux.
That being the case - look at your resolv.conf to make sure it’s pointing at the DNS you expect it to be pointing at. Perhaps reinstall Firefox - or better yet - use Konqueror to determine if it has similar behavior. This will tell you whether your DNS is being hi-jacked, or it’s a problem with just Firefox.
Hope these help some.
This is not my issue. This was a post on MozillaZine that I posted here.
This does not affect me (yet). I was merely pointing out the potential for ISPs to hijack network traffic to their own purposes.
Malware, or a virus, is a good explanation of this, though.