works great if you patch it Rated 4 out of 5 stars

This is one of my all time favorite FF add-ons AND I **REALLY** WISH THAT MOZILLA WOULD OFFER A REGEXP SEARCH OPTION OUT OF THE BOX . Anyway, it works fine for me with FF 4.0.1 *IF* you have manually patched the maxVersion number for firefox (google "manually update firefox addon 7zip install.rdf maxVersion"). I'm only giving 4 stars b/c I had to patch it myself.