ニコ生拡張機能 へもツール is a free add-on for Chrome that adds various features to the popular streaming platform, Niconico Live. With this tool, users can enhance their Niconico Live experience with a range of additional functionalities.

One of the main features of へもツール is the "コメビュ機能" which displays the ID or name of the commenter next to their comment, making it easier to identify who is commenting. Another useful feature is the "コメント読み上げ機能", which reads the comments aloud using voice synthesis.

へもツール also offers options to disable the right-click menu in Niconico Live games to prevent it from interfering with gameplay, as well as the ability to toggle the seek bar on or off to prevent accidental clicks during gaming sessions. Additionally, users can choose to turn off the streaming video while keeping the game interface visible, mute the audio of the streaming video, and even flip the video horizontally or adjust its brightness.

Furthermore, へもツール includes a "小窓表示機能" that enables picture-in-picture functionality, allowing users to watch the streaming video in a smaller window while still being able to view comments. However, it's important to note that this feature may increase the system load.

Please note that へもツール may not work if Niconico Live is updated, and the developer advises users to use it at their own risk.