minor but useful new feature: Test if a user provided string matches the
existing (active) filter rules.
At the moment, my solution for that is an empty HTML file I paste the
link/image/whatever to test into to load it via my local Apache.
This would probably best be included in the filter search function
(radio button? checkbox? its own button?).
I realise this would not be used by a lot of people, on the other hand,
it probably is not too difficult or code heavy to implement, as this is
exactly what ABP is designed to do.

What do you think?