A must have Rated 5 out of 5 stars

It's the little things this extension allows that makes it so great. Itself it doesn't do much, but it allows for a vast number userscripts that make browsing easier and better. Superpowering YouTube with no auto-play and auto-HD; improving Google's UI if wanted, download button for Tumblr mp3s, and much, much more. I just can't browse without it now.

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