Rated 5 out of 5 stars

This addon :
https://github.com/downloads/athomas/mozilla-firefox-addons/gmail_manager-0.6.4.1.5-fx+sm.xpi
that was added by alexthomas is working perfectly with FF9.

Rated 5 out of 5 stars

Waiting out the official updates this patch works with the official FF7:
https://github.com/downloads/athomas/mozilla-firefox-addons/gmail_manager-0.6.4.1.4-fx+sm.xpi