Metamask® Extension
MetaMask is a global community of developers and designers dedicated to making the world a better place with blockchain technology.
An Ethereum Wallet in your Browser
A secure wallet and gateway to blockchain sites Whether you are an experienced user or brand new to blockchain, MetaMask helps you connect to the decentralized web: a new internet. We're trusted by millions of people across the world, and our mission is to make this new decentralized web accessible to all. The MetaMask extension allows you to buy, send, spend, swap, and exchange your digital assets. Make pay ments to anyone, anywhere. Customize your wallet with community-built Snaps. Log into websites securely to trade assets, lend, borrow, play games, publish content, buy rare digital art, and so much more.
The extension injects the Ethereum web3 API into every website's javascript context, so that dapps can read from the blockchain.
MetaMask also lets the user create and manage their own identities (via private keys, local client wallet and hardware wallets like Trezor™), so when a Dapp wants to perform a transaction and write to the blockchain, the user gets a secure interface to review the transaction, before approving or rejecting it.
Because it adds functionality to the normal browser context, MetaMask requires the permission to read and write to any webpage. You can always "view the source" of MetaMask the way you do any Chrome extension, or view the source code on Github:
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