I think that browser user-agent-strings are far more trouble than they are worth.<p>I think at this point, if there are browser bugs in something as important as video, the release team or someone should pick it up before release as a show-stopper.<p>If the issue is on the server end, then the people running the server should be fixing their mess.<p>Do we know which it was? A Firefox issue that caused Youtube to detect the user-agent and server lower quality video, or was it an issue on Youtube&#x27;s end?