Sort of. You can deny access to a IP address, which would in-turn deny access to any websites hosted on that IP address.
If you don't want to play with IP addresses you can use HOSTS file ( C:\Windows\System32\drivers\etc ) and there write specific domains you would like to block in this format: 127.0.0.1 domaintoblock.com 127.0.0.1 domaintoblock2.com
what browser are u using...........ffox..........you can block it with adblocker......or better privacy
ad the site to spware blaster/spybot seasrch and destroy's lists of restricted sites
those restrictions will work on ie.......as well ..... or just put the addy in the restricted sections of either browser..plus what creer said
firewall's not the place to block the site addy -- 101ST ABN Div. (AirAssault) "Rendezvous With Destiny!" "Night Stalkers/Phoenix Flight" For Buddy...who lived it! Whiskey for my men and beer for my horses! H.A.L.O!, 5th Grp., MACV SOG, 160TH AVN SOG, Death From Above, VFW, AmLegion