Scrapbox List Marker is a Chrome extension developed by penicillin0 that allows Scrapbox users to easily customize the list markers in their projects. As a third-party extension, it provides a user-friendly GUI-based interface, eliminating the need to write complex CSS code.

With Scrapbox List Marker, you can simply click on the extension icon to open a popup window where you can customize the list markers for each paragraph. The color of the list markers can be changed to suit your preferences. Additionally, you can insert an indent line with a customizable color to enhance the visual clarity of your indentations.

A demonstration feature at the bottom of the screen allows you to preview how the customized list markers will appear in your Scrapbox project. It provides a convenient way to see the changes in real-time.

Please note that Scrapbox List Marker is an unofficial extension, so it is important to use it at your own risk. If you encounter any bugs or have suggestions for additional features, you can submit them on the GitHub page of the extension.