I'm guessing you don't work in corporate environment or no longer work from home.
There are times when video is expected to be on, but you don't want to show your room to everyone.
Having said that I can't think of firefox being able to stream video yet not being able to do this, so likely it is Google's way to make its competitor look subpar. Probably can be fixed by spoofing user agent. Ironically the most recent change in Chrome will make this very difficult in the future.
Yeah, also anyone who claims that they didn't switch to mastodon because it is too confusing, must have serious learning disability. I can understand that Lemmy is harder than traditional reddit, because the problem is more complex and the service still need a lot of polish, but mastodon is very simple to use.