[userSumo]

One thing i was thinking would be also cool is improving the image view (when you open .png url for example).it would be nice if it had proper smooth zoom using mouse wheel, and some preset zoom buttons for fit to screen, 1 to 1 pixel, etc. Maybe it could also open image links in just some simple popup window.

Other than that i would really like updated bookmark and history manager.

[throwaway66666]

So much this. Also the ability to change the background from black to white (with a slider or an easy to reach color picker that doesn't involve opening the console). It's so hard to notice when an image starts and ends when it has black at the sides, or to be able to distinguish transparent pixels easily.

[arc-the-lad]

Yes! The image zoom levels always bothered me, particularly the fact that it snaps to the size of the view vertically but not horizontally, making it hard to comfortably read vertically heavy images or use portrait-orientation displays.

[_Microft]

A way to rotate images without having to resort to the inspector and transform:rotate(...) would be nice as well there.

[pragmatick]

https://addons.mozilla.org/de/firefox/addon/better-image-vie... works reasonably well but doesn't have all the features you mentioned.

[catbird]

Yes! I used to have an extension that allowed you to resize any image (even in the middle of a page) by holding a button and scrolling. It was fantastic, but was never migrated to the new extension format unfortunately.