Cross Browser Extension Deployment

via “browser extension loading and execution within sessions”

🔥 Open Source Browser API for AI Agents & Apps. Steel Browser is a batteries-included browser sandbox that lets you automate the web without worrying about infrastructure.

Unique: Loads extensions at the CDP level during session initialization, providing full extension lifecycle management and message-passing APIs for communication with extension background scripts. Extensions have full page context access without requiring page modification.

vs others: More flexible than Puppeteer's limited extension support; allows full extension functionality including background scripts and message passing, whereas Puppeteer only supports basic content script injection.