Lets user customize the 4 sizes are available and the browser location on a screen works correctely with this extension. Why 4 sizes only? Extension's icon is nice, because it respects the Firefox UI and it consistent, if you see what I mean. But the menu design could be improved. I don't like the basic buttons that do not show anything. The hight level UI of Window Layout Resizer 0.1.3 could be a very good example to follow. I don't know witch one of this extension I will keep, because Window Layout Resizer 0.1.3 is not perfect too.

Perfect!

Now, with mouse/touch support this is the champion in the category.

Excellent - just works as it should!

The first resize addon which can handle negative position numbers and thus works with Windows 10's thin window borders.
The setup is simple and the short-cuts are intuitive.

Just a simple yet useful, functional window resizer I was looking for.

Very nice "recycled" and "improved" idea compared to resizeIT.
5 stars indeed ...
Thanks

I use it and it is surely the most handy window resizer.