ModBox is a free browser add-on for Chrome developed by Rob Phillips. It falls under the category of Browsers, specifically under Add-ons & Tools. This program allows users to block HTTP requests and sites, modify headers globally or based on domain and URL rules, and organize these rules by folder and tab structure.

With ModBox, users can create rules to modify HTTP request and response headers, block specific HTTP requests or entire sites, and scope tabs and rules to particular domains and URL criteria. The add-on provides a user-friendly interface to organize rules with drag and drop functionality, allowing for easy management. Additionally, users can toggle individual rules, tabs, folders, and global settings quickly. ModBox ensures privacy with no tracking, no commercial version, and no undisclosed practices.