Rated 5 out of 5 stars

A great addon. Here is a suggestion that could make it even better.

Allow multiple F12 to cause actions sequentially. For example:

F12 once - Minimize tabbar
F12 twice - Opens new tab/homepage or some other page as per settings
F12 thrice - Minimize window

And reverse these actions by Shift+F12
Shift+F12 once - Maximize window
Shift+F12 twice - Close new tab and/or Go to previous tab
Shift+F12 thrice - Show tab bar again

You can give the users the option to eliminate any one of these sequential operations. This way somebody could use it for many purposes
1. To hide tabbar and get more screenspace
2. To open homepage or google search or whatever
3. Minimize Firefox

But this would work best only if you make all settings configurable and optional

This review is for a previous version of the add-on (2.1.1-signed.1-signed).