Simple but it works. Unfortunately the interface only shows the button numbers "1", "2", "3", "4", so you have to remember yourself what were the preset dimensions you had set. Also, you cannot have more than four presets.

Thank you! It took me a minute to get the sizes and offsets set up the way I want them, but this will be such a time saver for me. I usually have lots of firefox windows open (in linux) and I mostly want them at something less than maximized and lying exactly on top of one another, and this extension makes that easy to achieve without any cumbersome and time consuming mousing around. And I can toggle two windows to be viewed side-by-side and then back again with ease.

ResizeIT 2 do a good job for setting window sizes + positions~ Its simple and practical~

It may better if :
1. show a name list (or window sizes + positions) will be clearly compared to numbers.
2. the icon if more like a series(with Firefox UI) will better

ResizeIt2 is the best Firefox window resizing add on I have tried.
With Firefox ESR 102, ResizeIt2 worked perfectly, 5-stars! But...
With Firefox ESR 115, ResizeIt2 will not position the right edge of the Firefox window to the right edge of the monitor.
With ESR 102, I could use ResizeIt2 to position the right edge of the Firefox window 4pixels to the right edge of my monitor. I want the right Firefox edge to the right of the monitor edge so I can quickly move my mouse to the right and page up/down and not grab the right edge of the Firefox window.
I can use Leomoon Hotkeyz to position Firefox windows like I want but it would be great if ResizeIt2 could do it instead.

UPDATE: the author's support site set me straight that this is a Firefox issue! FF no longer allows add ons to position a window off screen. Even with this Mozilla "feature" ResizeIT2 is the best FF resizer!

Great!
Size and position of the window together. Would you add an option to maximize the window?
Thanks.

Any reason why you Rewrote it? since the original still somewhat works^^
P.S. This one works fine! Good job

Over-complicated for what it does. Found this instead: https://addons.mozilla.org/en-US/firefox/addon/adjust-viewport-size/?src=recommended

Have used this add-on for at least a couple of years and can't fault it. Does exactly what it says on the tin.

Well done job but, would be nice to see more than 4 sets. At least 8-9 sets would be nice.

THanks! Great extension, can be adjusted as I want. Possibility to center window is extremely cool

Refreshing the window allowed to to return to the stupid full-screen. I need the SIZE & POSITION of the window to be fixed....

Hi! This is the most correct working resizer which I know. I think it could improve by adding the ability to set default size on start.

Exactly what I needed. Great, simple interface with excellent hotkey support. Thank you for a way to reset my browser size after I sometimes accidentally resize it by a few pixels and cannot get it back without Windows snapping taking effect and causing issues with fullscreening content.