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..

4 stars would be 5 stars if the extension can handle exporting Webp images to jpeg or png. Thanks dev!