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# MetaMask Browser Extension
[](https://circleci.com/gh/MetaMask/metamask-extension) [](https://coveralls.io/github/MetaMask/metamask-extension?branch=master)
You can find the latest version of MetaMask on [our official website](https://metamask.io/). For help using MetaMask, visit our [User Support Site](https://metamask.zendesk.com/hc/en-us).
For up to the minute news, follow our [Twitter](https://twitter.com/metamask_io) or [Medium](https://medium.com/metamask) pages.
To learn how to develop MetaMask-compatible applications, visit our [Developer Docs](https://metamask.github.io/metamask-docs/).
To learn how to contribute to the MetaMask project itself, visit our [Internal Docs](https://github.com/MetaMask/metamask-extension/tree/develop/docs).
## Building locally
- Install [Node.js](https://nodejs.org) version 10
- If you are using [nvm](https://github.com/creationix/nvm#installation) (recommended) running `nvm use` will automatically choose the right node version for you.
- Install [Yarn](https://yarnpkg.com/en/docs/install)
- Install dependencies: `yarn`
- Build the project to the `./dist/` folder with `yarn dist`.
- Optionally, to start a development build (e.g. with logging and file watching) run `yarn start` instead.
- To start the [React DevTools](https://github.com/facebook/react-devtools) and [Redux DevTools Extension](http://extension.remotedev.io)
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 `localhost`, port `8000`, secure connection checkbox unchecked)
Uncompressed builds can be found in `/dist`, compressed builds can be found in `/builds` once they're built.
## Contributing
You can read [our internal docs here](https://metamask.github.io/metamask-extension/).
You can re-generate the docs locally by running `yarn doc`, and contributors can update the hosted docs by running `yarn publish-docs`.
### 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
[][1]
## Development
```bash
yarn
yarn start
```
## Build for Publishing
```bash
yarn dist
```
#### Writing Browser Tests
To write tests that will be run in the browser using QUnit, add your test files to `test/integration/lib`.
## Other Docs
- [How to add custom build to Chrome](./docs/add-to-chrome.md)
- [How to add custom build to Firefox](./docs/add-to-firefox.md)
- [How to add a new translation to MetaMask](./docs/translating-guide.md)
- [Publishing Guide](./docs/publishing.md)
- [The MetaMask Team](./docs/team.md)
- [How to live reload on local dependency changes](./docs/developing-on-deps.md)
- [How to add new networks to the Provider Menu](./docs/adding-new-networks.md)
- [How to port MetaMask to a new platform](./docs/porting_to_new_environment.md)
- [How to use the TREZOR emulator](./docs/trezor-emulator.md)
- [How to generate a visualization of this repository's development](./docs/development-visualization.md)
[1]: http://www.nomnoml.com/#view/%5B%3Cactor%3Euser%5D%0A%0A%5Bmetamask-ui%7C%0A%20%20%20%5Btools%7C%0A%20%20%20%20%20react%0A%20%20%20%20%20redux%0A%20%20%20%20%20thunk%0A%20%20%20%20%20ethUtils%0A%20%20%20%20%20jazzicon%0A%20%20%20%5D%0A%20%20%20%5Bcomponents%7C%0A%20%20%20%20%20app%0A%20%20%20%20%20account-detail%0A%20%20%20%20%20accounts%0A%20%20%20%20%20locked-screen%0A%20%20%20%20%20restore-vault%0A%20%20%20%20%20identicon%0A%20%20%20%20%20config%0A%20%20%20%20%20info%0A%20%20%20%5D%0A%20%20%20%5Breducers%7C%0A%20%20%20%20%20app%0A%20%20%20%20%20metamask%0A%20%20%20%20%20identities%0A%20%20%20%5D%0A%20%20%20%5Bactions%7C%0A%20%20%20%20%20%5BbackgroundConnection%5D%0A%20%20%20%5D%0A%20%20%20%5Bcomponents%5D%3A-%3E%5Bactions%5D%0A%20%20%20%5Bactions%5D%3A-%3E%5Breducers%5D%0A%20%20%20%5Breducers%5D%3A-%3E%5Bcomponents%5D%0A%5D%0A%0A%5Bweb%20dapp%7C%0A%20%20%5Bui%20code%5D%0A%20%20%5Bweb3%5D%0A%20%20%5Bmetamask-inpage%5D%0A%20%20%0A%20%20%5B%3Cactor%3Eui%20developer%5D%0A%20%20%5Bui%20developer%5D-%3E%5Bui%20code%5D%0A%20%20%5Bui%20code%5D%3C-%3E%5Bweb3%5D%0A%20%20%5Bweb3%5D%3C-%3E%5Bmetamask-inpage%5D%0A%5D%0A%0A%5Bmetamask-background%7C%0A%20%20%5Bprovider-engine%5D%0A%20%20%5Bhooked%20wallet%20subprovider%5D%0A%20%20%5Bid%20store%5D%0A%20%20%0A%20%20%5Bprovider-engine%5D%3C-%3E%5Bhooked%20wallet%20subprovider%5D%0A%20%20%5Bhooked%20wallet%20subprovider%5D%3C-%3E%5Bid%20store%5D%0A%20%20%5Bconfig%20manager%7C%0A%20%20%20%20%5Brpc%20configuration%5D%0A%20%20%20%20%5Bencrypted%20keys%5D%0A%20%20%20%20%5Bwallet%20nicknames%5D%0A%20%20%5D%0A%20%20%0A%20%20%5Bprovider-engine%5D%3C-%5Bconfig%20manager%5D%0A%20%20%5Bid%20store%5D%3C-%3E%5Bconfig%20manager%5D%0A%5D%0A%0A%5Buser%5D%3C-%3E%5Bmetamask-ui%5D%0A%0A%5Buser%5D%3C%3A--%3A%3E%5Bweb%20dapp%5D%0A%0A%5Bmetamask-contentscript%7C%0A%20%20%5Bplugin%20restart%20detector%5D%0A%20%20%5Brpc%20passthrough%5D%0A%5D%0A%0A%5Brpc%20%7C%0A%20%20%5Bethereum%20blockchain%20%7C%0A%20%20%20%20%5Bcontracts%5D%0A%20%20%20%20%5Baccounts%5D%0A%20%20%5D%0A%5D%0A%0A%5Bweb%20dapp%5D%3C%3A--%3A%3E%5Bmetamask-contentscript%5D%0A%5Bmetamask-contentscript%5D%3C-%3E%5Bmetamask-background%5D%0A%5Bmetamask-background%5D%3C-%3E%5Bmetamask-ui%5D%0A%5Bmetamask-background%5D%3C-%3E%5Brpc%5D%0A
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