I've created two window sizes that provide the best aspect ratio for my most used applications, a news paper and weather site. Everything worked as expected. It would be nice to have an edit feature. Currently the add-on can only Add and Remove. Looking forward to improvement(s) in this app.
Increased to 5 star since the app now gives "edit" capability. Also, there is a new feature that allows you to resize the window and select, name and save the current size. Nice feature! Thanks for the good work.