firefox for windows vistaHow do I block a website on Firefox, Windows Vista?

It's urgent and necessary that it is for Firefox on Windows Vista.
How to Block A Web site in All Web Browsers

1. Click Start > All Programs > Accessories > Command Prompt
2. Click Command Prompt This will open a DOS command window.
3. Type: notepad C:/Windowsfirefox for windows vista/System32/drivers/etc/hosts
4. Locate the line 127.0.0.1 localhost
5. To block the website google.com for example, just add this text under 127.0.0.1 localhost:

127.0.0.1 google.com
127.0.0.1 www.google.com

You can add as many sites any site, However you will need to prefix it with &quofirefox for windows vistat;127.0.0.1".

6. Save the file
Google will now be blocked in all web browser. This is an advanced but easy method on how to block a Web site.

NOTE: This method is how some viruses block your ability to access a site.