by MetaMask

:globe_with_meridians: :electric_plug: The MetaMask browser extension enables browsing Ethereum bloc...

3.9K Stars 1.5K Forks Last release: 13 days ago (v8.0.10) Other 11.1K Commits 215 Releases

Available items

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MetaMask Browser Extension

You can find the latest version of MetaMask on our official website. For help using MetaMask, visit our User Support Site.

MetaMask supports Firefox, Google Chrome, and Chromium-based browsers. We recommend using the latest available browser version.

For up to the minute news, follow our Twitter or Medium pages.

To learn how to develop MetaMask-compatible applications, visit our Developer Docs.

To learn how to contribute to the MetaMask project itself, visit our Internal Docs.

Building locally

  • Install Node.js version 10
    • If you are using nvm (recommended) running
      nvm use
      will automatically choose the right node version for you.
  • Install Yarn
  • Install dependencies:
  • Copy the
    file to
    • Replace the
      value with your own personal Infura Project ID.
    • If debugging MetaMetrics, you'll need to add a value for
      Segment write key.
  • Build the project to the
    folder with
    yarn dist
  • Optionally, to start a development build (e.g. with logging and file watching) run
    yarn start
    • To start the React DevTools and Redux DevTools Extension alongside the app, use
      yarn start:dev
      • React DevTools will open in a separate window; no browser extension is required
      • Redux DevTools will need to be installed as a browser extension. Open the Redux Remote Devtools to access Redux state logs. This can be done by either right clicking within the web browser to bring up the context menu, expanding the Redux DevTools panel and clicking Open Remote DevTools OR clicking the Redux DevTools extension icon and clicking Open Remote DevTools.
      • You will also need to check the "Use custom (local) server" checkbox in the Remote DevTools Settings, using the default server configuration (host
        , port
        , secure connection checkbox unchecked)

Uncompressed builds can be found in

, compressed builds can be found in
once they're built.


Running Tests

Run tests with

yarn test

You can also test with a continuously watching process, via

yarn watch

You can run the linter by itself with

yarn lint


Architecture Diagram


yarn start

Build for Publishing

yarn dist

Other Docs

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