Almost the best solution for me to customize my web games windows. Could be great if there is any backup for my setup information. Each time I reinstall my Firefox the settings had just all gone.

After trying many resizers for Firefox, this is by far the simplest to use and the most flexible to configure.

This one is finally to work! I try 4 extension and no of them can work.

There are a couple of extensions like this out there, but this one was the only one that I could (easily) figure out how to save current window size as preset.
Crucial for streaming.

LOVE IT :D
Wish I could extract the settings though :D :D :D *hint* :p

It's very useful add-on for me. The only flaw is I cannot 1600 x 1045 for my ultra-wide LG displayer (resolution 2560 x 1080), I have to add 1600 x 1040 instead of. It's appreciated to have 1060 x 1045 in the updated version :)

Very good add-on. Would be absolutely perfect if you could display / determine your current window size. As a web designer I often need to know the exact size of the window to add media queries.

I was looking for an equivalent Firefox extension to Chrome's "Window Resizer" that I use for web development. After some search, this one seems the best alternative. It works very good.
Feature suggestion: Custom default presets for common monitor and mobile resolutions would be a great addition and would make your extension stand out from the crowd.

Works exactly as described, with the ability to make custom resolutions, reorder them as you wish, and with two clicks you can resize your window to your preference!

Wish I could give more than 5 stars. Well done.

My evaluation is 5 if I can save the current window size.

January 2, 2018 Addendum:
Since it became possible to set the current window size at Ver 0.6.1, I changed it from star 4 to star 5.

simple and useful

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.

This is exactly what I was looking for today. Perfect timing. Glad it doesn't require the window position parameter. Thank you for this useful extension.