why /etc/hosts don't effect to my firefox on Ubuntu 10.04?

Question

I tried to block some hosts to load from them ads and scripts. for example in /etc/hosts:

127.0.0.1 web-visor.com
0.0.0.0   c1.web-visor.com

Why after editing and saving the file, firefox (after restart) still load this sites (not from cache of course) ??

My /etc/hosts.conf seems to search previously in hosts file

order hosts,bind
multi on

What's wrong?

Answer 1

host.conf is obsolete, look in nsswitch.conf .

Answer 2

Does your Firefox use proxy? /etc/hosts SHOULD effect your Firefox (I tested it). What is the result of pinging those addresses?