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Three-part architecture: - inpage.js: creates window.ethereum in page context with request(), on(), send(), sendAsync(), enable() methods. Sets isMetaMask=true for compatibility. - content/index.js: bridge between page and extension via postMessage (page<->content) and runtime.sendMessage (content<->background). - background/index.js: handles RPC routing. Proxies read-only methods (eth_call, eth_getBalance, etc.) to configured RPC. Handles eth_requestAccounts (auto-connect for now), wallet_switchEthereumChain (mainnet only), and returns informative errors for unimplemented signing methods. Manifests updated with web_accessible_resources for inpage.js. Build updated to bundle inpage.js as a separate output file.