Great, although... Rated 4 out of 5 stars

Really great. The only reason why I am not putting a 5 here is I want the author of this product to have a chance to read this review.

This is an essential addon in the prevention of malware. Use * to block all. IT WOULD BE GREAT TO HAVE THE OPTION TO BLOCK ALL *EXCEPT* GIVEN EXTENSIONS, for example, * \pdf -- meaning, block ALL, except PDFs.

Awesome product. Highly recommended.

This review is for a previous version of the add-on (1.09).  This user has other reviews of this add-on.