Niconico-PepperMint+ is a browser extension developed by CYakigasi with the aim of making Niconico videos even cooler. This extension offers various improvements to Niconico, including features such as "Series Stock" for bookmarking series, a theater UI, dark mode, and a two-column layout for video top.

One of the great things about Niconico-PepperMint+ is that most of its features can be easily toggled on or off through the toolbar's quick settings or the extension management settings. By default, all features are disabled upon installation, allowing you to customize the extension according to your preferences.

For a complete list of features, you can visit the extension's Github page. If you encounter any bugs or have any feature requests, the developer encourages you to submit them through Github's issue tracker. Additionally, you can follow the developer's Twitter account for updates and information on the development progress.