360° video not being supported is demonstratably false. Below is an embedded YouTube 360° video. Viewing it embedded in my blog page, it displays perfectly. However, if you click through to YouTube using the YouTube icon on the video, you will be told “360° video playback is not supported on this browser.”
What’s wrong, Google/YouTube? Not enough people using Chrome?
Update: A couple of weeks later, 360° functionality was restored for Firefox. No fanfare, no explanation.