It is frustrating to browse some news sites and click on video articles, only to have the thumbnail grayed out with a spinning circle cursor. This happens even when I change the setting for a specific site to allow auto-play. I usually just copy the URL and paste it in to Microsoft Edge to see it if I really want to.
Please provide something (an error code or a plain-text message) that gives some indication of the technical reason a video won't play. Here are some examples of what I'd like to see:
error 123 - invalid codec
error 125 - missing codec
Addin "Adblock Plus" has prevented this video from playing.
Addin "Disconnect" has prevented this video from playing.
I would then be able to either report to Mozilla that a totally new codec is in use and should be added to the next update of Firefox, or I would know specifically which add-in is causing my issue.