Firefox, Greasemonkey. Rated 5 out of 5 stars

I am great fan of this particular add-on, If I want certain JavaScript on my Firefox, I can just put it through Greasemonkey. Its very compatible and also better functioning than other alternatives. I will recommend this add-on for many Firefox users.

This review is for a previous version of the add-on (0.9.20.1-signed).