coverArt is implemented via the mediaSession API, but it does not load in this setup:
- browser: firefox
- system: macos
- tinysub version: latest master https://tangled.org/devins.page/tinysub/commit/2edab196ea6d1fde7e3994e1006905fae9cf0350
- the application is being accessed over http on headscale magic DNS

it does work correctly in the demoserver, so i suspect its some sort of CORS issue with my setup.