Rated 5 out of 5 stars

Just go to http://code.google.com/p/firetray/downloads/list, and download the 0.3.1 source.
Edit the generate_install_rdf.sh to set max version to 6.* and run build.sh to make the extention work with the new version of xulrunner.
Tested and approuved on X86_64 with archlinux

This review is for a previous version of the add-on (0.3.1).