eg: if you are using firefox and watch a livestream, the widget wil display an incorrect time instead of indicating it is live
Created attachment 176997 [details] screenshot
This is due to Youtube providing incorrect length information; they should instead provide a Inf duration to indicate that it is a livestream. If you e.g. go to Twitch, the media player displays correctly there.
*** Bug 498793 has been marked as a duplicate of this bug. ***