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You should always use the latest version of an add-on.
Version 5.1Released Nov 18, 2017 - 694.7 KBWorks with firefox 57.0 and later, android 57.0 and laterNew improved UI and Firefox Quantum compatibility!
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.
Source code released under MIT/X11 License