Ok so,in http://www.sunnyneo.com/adblocking.phpwebsite, I followed the steps (for Mozilla Firefox) on Adblock.
When I un-installed Mozilla Firefox one time because it wasn't working right,it was automatically gone. Then,when I tried downloading it again because I really don't like to see ads. So,I followed the steps again for Mozilla Firefox to download Adblock,it wasn't working right. I have tried several times,but nothing happened. Please help me on what to do. Or is there any AdBlock programs to use and safe? Please tell me Thanks in advance!

Use this:

https://addons.mozilla.org/en-US/firefox/addon/1865