MetaMask Extension is a wallet that helps a user manage his crypto assets in a safe wallet. It also supports a wide range of currencies, giving people plenty of options. The extension also helps in managing the account’s private keys. If you are a professional trader and mainly deal in ERC tokens, you should definitely use this extension. MetaMask® Extension - Browser extension - webflow MetaMask is a popular cryptocurrency wallet and decentralized application (dApp) browser extension that allows you to manage your Ethereum-based assets and interact with Ethereum dApps.