Violentmonkey is a userscript manager that allows users to customize their web browsing experience by running scripts on specific websites. It is available as a browser extension for various web browsers, including Chrome, Firefox, and Opera. Users can install scripts that modify webpage content, automate tasks, or enhance functionality. The extension supports a wide range of userscripts, which are small JavaScript programs created by developers. Violentmonkey provides an easy-to-use interface for managing these scripts, enabling users to enable, disable, or edit them as needed. This flexibility allows for a more personalized and efficient browsing experience.