# MetaMask Browser Extension
[![Build Status ](https://circleci.com/gh/MetaMask/metamask-extension.svg?style=shield&circle-token=a1ddcf3cd38e29267f254c9c59d556d513e3a1fd )](https://circleci.com/gh/MetaMask/metamask-extension) [![Coverage Status ](https://coveralls.io/repos/github/MetaMask/metamask-extension/badge.svg?branch=master )](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 and the latest available npm@6
- If you are using [nvm ](https://github.com/creationix/nvm#installation ) (recommended) running `nvm use` will automatically choose the right node version for you.
- If you install Node.js manually, ensure you're using npm@6
- Install npm@6 using `npm install -g npm@6`
- Install dependencies: `npm ci`
- If you have issues with node-sass compilation, try `npm rebuild node-sass`
- Build the project to the `./dist/` folder with `npm run dist` .
- Optionally, to start a development build (e.g. with logging and file watching) run `npm 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 `npm run start:dev` . You'll need to install the Redux DevTools to access Redux state logs.
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 `npm run doc` , and contributors can update the hosted docs by running `npm run publish-docs` .
### Running Tests
Run tests with `npm test` .
You can also test with a continuously watching process, via `npm run watch` .
You can run the linter by itself with `npm run lint` .
## Architecture
[![Architecture Diagram ](./docs/architecture.png )][1]
## Development
```bash
npm install
npm start
```
## Build for Publishing
```bash
npm run 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