Sorry if these are stupid questions.

Not at all! Thanks for taking an interest.

Does this only show these foss_photo_libraries and your local photos?

I’m not sure what you mean. foss_photo_libraries is a comparison table of different apps someone else maintains, but I thought it was a useful resource. The photos in the demo are a subset of the open images dataset and a couple of other samples that I picked for demo purposes.

If you install it locally you can point it to a folder and it should use each subfolder as an album, or you can configure custom albums.

Does it support jpegXL?

Yes actually, but I don’t have many files to test it, so I’m not sure how well it works. If you do I’d be interested to hear how it works for you. It uses FFmpeg to on-the-fly convert anything it can’t read natively.

I’d love a seamless zoom feature for images in the browser. I use imagus but I’d love if the popup window could zoom to be bigger than the browser window.

You can zoom by using the mouse wheel or by pinching to zoom if that’s what you mean? You should be able to zoom pretty much as much as you want. If you’re in the main view where the mouse wheel scrolls photos up and down you can hold Ctrl (Cmd?) to zoom instead.