I got annoyed by the lack of distraction-free image viewers extensions for the browser, so I made one.
https://github.com/lucacicada/slick-viewer-web-extension
Basically, I do like the built in image on most browser, but it lacks controls, I cant pan, cant zoom, cant rotate, cant do anything!!!
In order to be distraction-free, I'v had to come up with some gesture based controls, and I'm quite happy with the result.
If you click on the side and drag, you will rotate the image.
Rclick+wheel will zoom in/out.
Lclick will pan.
And then I'v run out of ideas and left the extension as it is.
I'm using it daily and I feel it's not quite there yet...
One thing, the extension has been published with the manifest v3 as soon as it was available, that have saved me from needing to update it.
It uses a custom made BEX Vite plugin I made, todays there are way better modern alternatives, but at the time, I did not found a plugin that would work for Firefox, only for Chrome.