Tampermonkey is a userscript manager used for browser behavior modification and web page automation. It allows for the installation and management of custom scripts that inject JavaScript into web pages to change their appearance or functionality.
The project enables cross-browser script synchronization to maintain a consistent set of modifications across multiple devices. It provides a mechanism to manage custom userscript collections and synchronize them via cloud accounts.
The system covers a broad range of capabilities including the automation of repetitive tasks on specific websites and the provision of advanced browser APIs to scripts for resource loading and system notifications.