Please add support for the Ultra HDR image format (not just the backwards compatible JPEG). When viewed on a compatible monitor, the results are truly impressive.
With Android, Adobe, Chrome, and Instagram/Threads, all adding support over the last year, I think gain-mapped JPG is going to start to take off this year. I'm definitely looking forward to it, as I've discovered a ton of the RAW photos I've shot over the last several years have significant HDR content and they really do look stunning to see in full HDR.
I've seen a lot of "bump" and "me too" posts on the bugzilla thread, but I'd love to see a response from mozilla at some point 🙂