eirk I thought the original report, along with the video, was fairly clear but I'm more than happy to elaborate. The correct title, which it eventually changes to, would be the title of the YouTube video. There is no such thing as a "thumbnail title". Rather, the text in the thumbnail (ie. video length, watch later, add to queue) is set as the tab title initially. Chrome, Safari, and Firefox all have the correct behaviour, which is the same as the expected behaviour listed in the report (ie. not displaying thumbnail text).