Rated 5 out of 5 stars

Excellent tool. Works as advertised. Have one two minor complaints:1) Speed. For example closing windows (tabs) of sites whose history is blocked incurs quite a noticable delay.2) I recently noticed that if you have a download running from a blocked site and you close the tab that this download was started from, the running download is aborted and just vanishes from the download list. Not really sure if this is supposed to be like this ;-)Looking very much forward to a 4.0 compatible version of this excellent addon.

This review is for a previous version of the add-on (1.3.5).