A review of this userscript's code shows that it is a scam: it Likes several Facebook pages without the user's knowledge or consent.

It has this in common with virtually every other userscript submitted by this author.

Thank you creator... It just worked for me... Its really great n really helpful one... :) :) :)

This script is a scam. It's intended to get "likes" for the script author, not for you. If you install it, it makes you "like" a bunch of pages you didn't intend.