The Little "Red Dot" on Loading YouTube Videos

Have you seen it? The little red dots which have recently started appearing in the top left corner of loading thumbnails of YouTube videos.

What is this? I can tell you what it is not: it's not an indicator for a user being online or offline. It is not an indicator of "partner" (or Google Adsense) videos. It does not have anything to do with recently added videos. It does not have to do with active sharing or "videos being watched right now".

The answer is.... It's a new feature of Mozilla Firefox :) It's nothing to do with YouTube, lol. Yah, it fooled me also.

***If you have a complaint, email me at StuffWrongWithYouTube@gmail.com and I will probably post it.