Pattern: Stagewise Redefines Browser as Development Environment — YC-Backed Coding Agent with Console/Debugger Access on All Tabs

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Stagewise (6,515 stars, YC S25) has evolved from a browser extension into a purpose-built developer browser where the coding agent has native console and debugger access across all tabs. Developers can select elements, describe changes in natural language, and the agent edits production codebases directly across React, Vue, Angular, Svelte, Next.js, and Nuxt. This represents a new category: the browser itself as the IDE, not as a preview target.