Rated 3 out of 5 stars

@linopolus: The extension is the source. Download the .XPI and unpack it with any Zip 2.0-compatible archiver. Presto change-o, source.

It's still using MD5, though. I'd look for a hasher that implements SHA1 or (better yet) SHA512. Just in case.

This review is for a previous version of the add-on (1.7.1-signed).