Review for MinimizeToTray by Z Wang
Rated 3 out of 5 stars
Minimizes to tray when i push the x on the top right or alt f4 - great, this is exactly what I wanted.
However, I feel it would be more useful if it also minimized when using the ctrl w hotkey to close thunderbird.
To create your own collections, you must have a Mozilla Add-ons account.