Not yet rated

Although it's a great feature for Firefox, I don't understand the purpose in TB. If several msgs are open in different windows, hitting the X closes them. And adding the Exit Button does not cause those windows to restore on the next start (is this a bug?)

Also we have the keyboard shortcut Cntrl/Q to File/Exit which is a no-brainer.

This review is for a previous version of the add-on (0.5).