Claude’s New Chrome Extension: The Secret Weapon Everyone Should be Using

Anthropic has launched a new Chrome extension, powered by Claude Opus 4.5, giving Claude full browser control. It can navigate, search, and summarize web content, demonstrated by finding OpenAI news on Twitter. The extension also includes a "teach Claude" mode for custom workflows, though initial tests noted it can be slow and struggle with fine details, despite showing spatial awareness. Crucially, the extension integrates with Claude Code. This allows Claude Code to build and run local web applications, and then *directly control the browser* to interact with them. For example, it transformed a "hello world" app into a lead magnet form and automatically filled out its fields for testing. This direct browser manipulation from the IDE is a powerful capability, showcasing significant potential for full-stack development, including backend integration like Firebase.