Simple & good Rated 5 out of 5 stars

Does do what it should do.
Thanks to the autor!

The "list of blocked sites" window could be made resizable, though.
Also, I wonder if there's some help pages, which explain the use of wildcards. "Somehow" they seem to work, but not always like I'd expect...

This review is for a previous version of the add-on (0.7.1).