Browser automation MCP servers give AI assistants real-time control over a web browser — navigating pages, clicking buttons, filling forms, taking screenshots, and extracting structured data from any website. They are popular for web scraping, automated testing, filling out forms, and research tasks where the target data does not have a public API. Servers like Playwright MCP and Puppeteer MCP are among the most starred projects in the MCP ecosystem because browser control unlocks a huge surface area of the web for AI automation.