Firefox

[Dezza]

Another option, if you have a router, would be to log into the router, and set up a block that way. On mine, for example, if I wanted to block my parents from going to youtube, I would add a rule saying to check all HTTP traffic from 192.168.0.51 (Their machine) for *.youtube.com and send them a nice little blocked message if successful.

Edit:

2) Type in "C:\Windows\System 32\drivers\etc\hosts" and hit OK

This is not the best method. Not everyone has Windoze installed on their C: Drive.

A better alternative would be %windir%\system 32\....

[ThievingSix]

True, but for the people who don't have it installed on their main drive should know what I mean.

C:\ is more common knowledge than global variables.