YouTube Player Speed Controls is a Chrome add-on developed by Seishin4real. As the name suggests, this add-on adds playback speed controls to the control bar of the YouTube player. With this feature, users can easily adjust the playback speed of videos to their preference.

The addition of playback speed controls to the control bar makes it convenient for users to change the speed of YouTube videos without having to go through any additional settings. This can be particularly useful for those who want to watch videos at a faster or slower pace, depending on their needs. Overall, YouTube Player Speed Controls enhances the user experience by providing a simple and accessible way to adjust the playback speed of YouTube videos.