Rated 3 out of 5 stars

Well thanks for the quick response. Where do you tweak the settings on this so I can add or delete items to it's whitelist?

This review is for a previous version of the add-on ( 

The whitelist is seamless

We wanted to make the simplest whitelist possible, so you don’t have to manage an actual whitelist.

When you’re on a site and click the icon in the location bar to unblock Facebook, the add-on remembers to keep Facebook unblocked the next time you go to the site — i.e., the site gets put on a whitelist in the background.

When you block a site, the site likewise gets pulled from the background whitelist.