Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
The ability to choose where you want to use the Maximize option, or if you want one more spot for a custom size.
All your settings are stored by Mozilla with the help of 'storage.sync'. So now your settings can be synced to another computer you are sign-in on.
I added profiles as well, if your other computer have a smaller resolution you can just save those settings to Profile #2 without loosing the settings you set before.
I will try to deliver a new GUI that works hand in hand with Firefox 4.
In Firefox 4 you cant resize you 'Firefox main window' while Firefox addon dialog is shown.
* True Full-screen.
* Customize options.
* Added window position alternative.
* No need to restart Firefox for changes to take effect.
* And lots of tweaks and changes to the code.
Sorry for slacking off!
NOT tested on Linux or Mac...