The extension

Load the beta extension

WebMCP Today is in public beta. The extension is not in a store yet, and its behavior may change as the registry and WebMCP platform develop. Download its release ZIP, then load the extracted folder into the supported Chromium browser you already use.

It stores the package versions you approve and registers their tools on matching pages. If something breaks, report it in the project's GitHub issues so the beta can improve.

Checking for the WebMCP Today extension…

  1. Download and extract the beta release

    Download the WebMCP Today extension ZIP and extract it to a folder you can keep. The browser loads that extracted folder directly.

  2. Load the extracted folder

    Open your browser's extensions page, enable Developer mode, choose Load unpacked, and select the extracted folder. Download and extract a new release, then reload that folder when you update it. The browser may show a developer-mode warning at launch.

  3. Confirm the extension answers

    Return to the readiness check above. It probes the extension through its own bridge API instead of assuming support from the browser name. No WebMCP testing flag is needed for this path: the extension's built-in fallback registers tools without it. The flag only matters for Chrome's native agent.

  4. Install a package in the browser

    Open a matching site, click the extension icon, inspect the suggested package, and click Install. The visible browser confirmation is deliberate; installed tools update the open matching tab without needing a refresh.

Update

Update an unpacked extension

Unpacked extensions do not update automatically. Download a new release, replace the contents of the folder Chrome already loads, and reload the same extension. Do not remove it first: removing it can clear the package data stored with the extension.

  1. Open the exact release

    Use the exact release notes, versioned ZIP, and SHA256SUMS links above. They are loaded from the same release metadata the extension checks.

  2. Keep the existing extension directory

    Open chrome://extensions, find WebMCP Today, and use its displayed source path to locate the folder that is currently loaded. Extract the new ZIP and replace the contents of that same folder.

  3. Reload, do not remove

    Return to chrome://extensions and click Reload on the existing WebMCP Today entry. This preserves its identity and locally stored packages. Chrome Web Store installs will update through Chrome when the store version is available.

Continue to the bridge quickstart to install the macOS native host, configure the first-party MCP server, and verify a live tool call.