UserScripts.org is a website that hosts a collection of user scripts, which are small pieces of JavaScript code that enhance the functionality of web pages. These scripts can modify the appearance of websites, automate tasks, or add new features, making browsing more efficient and enjoyable for users. The site allows users to share their own scripts and discover those created by others. It serves as a community hub for developers and users interested in customizing their web experience, often utilizing popular browsers like Firefox and Chrome that support user script managers.