Rated 4 out of 5 stars

I built it directly from the source (http://code.google.com/p/vimperator-labs/) and it works great with Thunderbird 15.

hg clone https://code.google.com/p/vimperator-labs/
cd vimperator-labs && make

Then install the muttator xpi in the downloads directory.

This review is for a previous version of the add-on (1.1).