The "小杰直播间专用插件" is a free Chrome add-on developed by hypu1215. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This add-on is designed for use in the 斗鱼超级小桀房间 (Douyu Super Xiaojie Room) and provides various features for users.

With this add-on, users can view their own points (after logging into Douyu), manually place bets, automatically check in, and even check the points of other users. It is important to note that when using this add-on, users are expected to adhere to the Douyu bullet screen guidelines and follow any specific instructions provided in the live room.

Please note that I have not personally reviewed this add-on and can only provide information based on the details provided.