This blocker may not have all the functionality of others, but, then again, it's less than 100 kB in size, not over 4 MB, and it does literally the same job! Better yet, it works instantly, no need to restart the browser after installation or updating. The only tool I really miss from the bigger extensions is the site sniffer, to see all the allowed and blocked servers a Page accesses.

It works as it says, thank you.

This is a very good add-on to prevent time-wasting pages. I wish I could find a faster way to include in the blacklist the pages to be blocked. Many thanks.