it doesn’t do any of that service worker image caching (just uses the browser cache), and it’s never experienced the issue. Funny enough, one release of Photon did implement that kind of caching via service worker, and startrek.website images broke immediately. Removing that part of the SW fixed it (the dev has also since removed that from the SW).

So I don’t think anything is misconfigured on startrek.website, but the

Thanks, that was really useful. Also explains, why Jerboa seems to work for me, but the web frontend looks broken.