0 Hack Firefox - How to Hide User Agent ?

Hello Today i am going to teach how to change user agent in firefox. So, First open your Firefox browser  and type about:config in your Address bar. then press "enter". 

After Press "enter" You can see the below option.

then Accept the warning and click on "I'll be careful, I promise!"
Find "general.useragent.override" then press right click and choose "Modify".

After Choose Modify, Rename it. that's all you crack your firefox user agent. now when you open any website its not show your browser information. its show only your renaming value.