When I type "google.com" or "http://google.com" into the address bar in Firefox I end up with the following screen requesting some login and password.
When I try the same in Chrome or Opera, I get redirected to www.google.com or www.google.pl. I killed dnsmasq and in /etc/hosts there's nothing similar to google.com.
When I press Cancel, I get the following error 401 message.
What is going on? Is it a virus? But why is it active only for Firefox?
Any help will be highly appreciated!
I use an up-to-date Ubuntu 12.04 with Firefox 26.0.
Update: I first noticed the problem, when I lost my internet connection (I mean formally there was a connection, but there was no or hardly any transfer) without any reason (the first thing I did was typing google to check if it is a problem with a single domain or the whole connection).
I just tried the same on another machine with similar configuration (my current Ubuntu was cloned from that a few months ago) and everything is OK...