uMatrix is now my #1 most essential add-on for Firefox. It lets me know at a glance what Web sites are trying to cram down my throat, and it lets me selectively allow exactly the minimum to get the functionality I need.

Just ONE small request, which would make this add-on PERFECT: I'd love to see a way of saving multiple configurations for a single site. Very often I develop a lower-security setting to get at specific content - but I need to re-enter it from memory every time I visit the site looking for that particular content.

Otherwise, bravo! I'll never willingly use the Web without uMatrix.