I tried it Today with 115.15.0esr (which shall be the latest when i check it) and it didn't work. Maybe it's something in my Windows Settings..... i did disable a lot of Things and maybe one of them causes the Problem (just a Suspicion ).
Later I will investigate it and report it to Firefox if needed. It seems to be a global problem since we're having the same result in two different systems and locations. The most recent result I found on google is a post on reddit from August where a guy says he can't reproduce any video.
Chris, in my case disabling this plugin solves the problem View attachment upload_2024-9-18_15-20-49.png
Interesting. I use that too and the Upload always did work with the Plugin being activated. But you are right, disabling it, solves the Problem. Thank you for investigating! BTW One of, if not the best Firefox Plugins. Without that, you can not watch Videos on Youtube anymore. EDIT I've qouted your Post as the Solution in the opening Post of this Thread
