Rated 5 out of 5 stars
Great extension, it should be part of Firefox.
The problem with the latest Flash Player version 11.3.300.262 (not sure if it happens with any other of the 11.3 series) and Muter not being able to silence it, former revierwers reported and I had to deal with, it's probably the same as this one http://support.mozilla.org/es/questions/930010#answer-344233 Now I'm using 10.3, as recommended to keep the latest security patches, and Muter is working fine with Flash.
I don't see the point of the drop marker in the addon bar icon, as it's redundant with the secondary click, but as long as it is optional it's fine.
(FF 16.0a1 32-bit on win after editing maxversion into install.rdf)