Rated 5 out of 5 stars

eclipsegts1: You just pressing CTRL+O in Firefox and choosing the XPI-file, or installing it through an javascript like the one on this page.

I've found the newest on the Todd Long's site:
http://www.longfocus.com/firefox/gmanager/releases/gmanager0575b2.xpi

Anywho.. To stay on-topic: This extension rules :-)

This review is for a previous version of the add-on (0.5.7.5).