Ok so I've been searching for a way to block makemoniesonline.com with Firefox but couldn't neither find a built-in function or add-on for that. So I started googling and finally found something that WORKS...here are the steps...
Source: How to block websites using firefox? - Windows Software
AWESOME!!!! I can't be dickrolled anymore... :action-smiley-052:
Be logged in as a privileged user.
Open a DOS command window, type:
notepad C:\WINDOWS\system32\drivers\etc\hosts
Put the following line in hosts:
127.0.0.1 www.google.com (whatever you want to block)
File > Save.
Now try to open http://www.google.com with any web browser on the PC.
Remove the line you added from hosts to restore access to the Google
web site
Source: How to block websites using firefox? - Windows Software
AWESOME!!!! I can't be dickrolled anymore... :action-smiley-052: