This extension is unironically better than any built-in photo editor/viewer Windows ever had by default. 99% of the things I want to do with the picture, I can do while it's still in the browser.
Crazy good.

Perfect image viewer! I really like the zoom its very convenient. The rotate feature for those wrongly portrait photos in landscape, the editing everything is excellent. 100% recommended addon

Great extension, thank you!

Love this addon! The only drawback is, it doesn't work on Reddit

Amazing addon. If there is a way to, please allow this for installation in android. It is working pretty well, but needs a specific third-party firefox fork to install.

Does exaclty what it says and that in a very smooth way.

Two things that keep me from switching from the now-unsupported Better Image Viewer: the dark theme isn't the same as firefox's default, and the image can't be made to fit the entire window (not fullscreen, just browser window width or length). Even better if the latter can be set to default.

Great extension.. But photo editor is not working right now.. A simple request to the developer: Is it possible to add a settings button to switch "always show details panel" . That would be very helpful..

best viewer in ff