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Leather is the most popular and trusted wallet for apps built on Bitcoin. Connect to apps and manage assets secured by Bitcoin and Bitcoin L2s with battle-tested wallet for the Stacks blockchain.

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This application is a browser extension. There is no ability to run it as a standalone web application.

Each child of the src directory represents the JavaScript context in which it is ran.

Dev mode

When working on the extension, you can run it in development mode which will watch for any file changes and use react-refresh to update the extension as you work. This gives us near instant reloading of our changes, and persists the state of the application between changes. To start development mode for the extension, run this command:

yarn dev

Optional: run test app

We bundle a test app to use along with the extension. It gives easy access to the various functions that the extension can do.

In a separate terminal, run:

yarn dev:test-app

Loading extension in your browser

You'll need to add it to your browser of choice. Leather only supports Chromium and Firefox browsers. When you run yarn dev, it will compile the application to the /dist folder


Several testing scripts are available in package.json.

The integration tests expect the extension to be built prior to running. The extension can be built for tests with the command below.

yarn build:test

The integration tests use Playwright, which requires the system to have the browsers it needs. The following command installs everything Playwright needs.

yarn playwright install --with-deps

Note that the installed browsers are tied to the version of Playwright being used, and it may be necessary to run the above command again in some situations, such as when upgrading Playwright or switching branches. Read the documentation for more information.

Integration tests

All integration tests can be run using:

yarn test:integration

To run a suite of tests you can use:

yarn playwright test specs/TEST.spec.ts
yarn playwright test tests/specs --shard=3/8

Unit tests

Unit tests can be run with vitest using:

yarn test:unit


See instructions on to install from source

Alternatively, the following steps can be taken by technical users with the latest version of node installed on their machines.

Build from source

Run the following from within this repository's root directory if you've pulled it with Git:

yarn && yarn prepare && yarn build

The extension is now built in the ./dist folder.

Firefox reviewers

To build the extension in Firefox mode, the TARGET_BROWSER=firefox variable needs to be set.

yarn && yarn prepare && TARGET_BROWSER=firefox yarn build

Note that when building in a clean environment, some code may vary between this and the submitted build. This is because some variables are set within the scope of the production build's CI.


We consider the security of our systems a top priority. But no matter how much effort we put into system security, there can still be vulnerabilities present.

If you discover a security vulnerability, please use one of the following means of communications to report it to us:

Please note this email is strictly for reporting security vulnerabilities. For support queries, contact Your efforts to responsibly disclose your findings are sincerely appreciated and will be taken into account to acknowledge your contributions.

Audit Report

In Q1 2021, Leather partnered with Least Authority, a leading security consultancy with experience in the crypto space, to audit Leather. On April 29th 2021, after addressing the major concerns described in the initial findings, as well as a concluding sign off from the Least Authority team, a final report was delivered.

Download and read the full report here