I won’t miss Theora - but I am as part of my job helping a business migrate from some old open-source software which inexplicably re-encoded almost all audio uploads into Ogg Vorbis audio files.

I can just play those as they are, in any browser, except Safari. Painfully, macOS actually supports Vorbis, but only in a CAF (Core Audio Format) container instead of an Ogg container. Still hoping; because shipping an entire Ogg decoder in the browser with WASM works but is ugly.

Of course, I could also just re-encode them with a microservice but it’s just… bleh.

You might find this helpful: https://github.com/brion/ogv.js

From the FF announcement linked elsewhere in these comments.