Rated 5 out of 5 stars

This extension is excellent for traying Thunderbird in Linux. However, I made 3 modifications to suit my desire:

1. The tray icon is always the Thunderbird icon;

2. Clicking the tray icon only hide/show the main Thunderbird window (i.e. excluding message windows);

3. Remove the unnecessary separator at the top of the tray menu.

The modified core.js is at:
http://pastebin.com/f62302966

This review is for a previous version of the add-on (0.1.11).