Can you please add an option to stream video content in a Firefox window to a media renderer on the same network with DLNA/UPnP?
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This is very good, and usefull idea!
I stream from this computer (running ARCH Linux to my home network with a streaming app called TVMOBILi. I purchased this app, even though it's Linux in 2008 or so, even though it runs on open sourced software because its developer made it work with the older version of Samsung TVs' In the mid 2010's he dropped out of development as Kodi and Plex kind of took over the market, but IMHO it works better because it does not support a media center. It just publishes from your files which you can organize any way you want it. But I can't find players outside of my Samsung and LG TVs which see it on my home network. I'd like to play streams on my computers with big monitors now. the web browser would be just fine. And, yes, I've kept it going on Ubuntu, Mint, SuSE and ARCH booting from init.d and systemd.
Chrome and Edge has casting, Firefox has nothing.