If watching a short video, the video will continuously loop. Attempting to pause the video will not pause the video. This was observed in a fresh profile. Here is a video that is short enough for this effect:
Similar auto replaying was observed intermittently on longer videos at the end, but I was unable to pinpoint a pattern with those. Safari did not have the same issue.
The video should stop at the end and not replay automatically. When the video is paused, it should pause.
Version 0.99.133-beta (WebKit 621.1.2.111.4)
Sequoia (15)