Rated 5 out of 5 stars

bởi sberg43 vào Tháng 8. 15, 2010 · liên kết thường trực

I too was unable to use this add-on after the update to Thunderbird 3.1.2. A nice replacement is "MinimizeToTray revived"
https://addons.mozilla.org/en-US/thunderbird/addon/12581/

(My rating is for the new add-on)