This Chrome add-on, "ニコニコ動画で操作追加," enhances specific controls while watching NicoNico videos. By installing this add-on, users gain access to several useful features. These include changing playback speed from 0.1x to 5.0x at the start of video playback, toggling play/pause by clicking on the video, switching to fullscreen by double-clicking, adjusting playback speed with Q/E/R keys from 0.1x to 5.0x, setting speed with the Q key, moving the seek bar from 0% to 90% using the numeric keypad "0-9," and navigating 10 seconds forward/backward with the mouse wheel while on the video.

All these features are customizable through simple ON/OFF toggles, making for a convenient and personalized viewing experience.