FireFox question

I was wondering if there is any way to block a website on firefox.

Say for example I wish to block sythe.org is there any way to on firefox?

There any add ones either so if I know a site I can block it?

 

Windows XP:
C:\WINDOWS\system32\drivers\etc\

Windows 2000:
C:\WINNT\system32\drivers\etc\

Windows 98/ME:
C:\WINDOWS\

go there and find your hosts file
open it in a text editor and put 127.0.0.1
then put the site after a space next to it
this will tell the browser to look for the site on you computer
since it isn't on your computer it can't connect to it

 

Not an easy way. I just noticed that. :s

 

Thank you cow.

Thats to hard though. Don't want to ruin my computer.