Metamask Extension - A crypto wallet & gateway to blockchain apps MetaMask is an extension for accessing Ethereum enabled distributed applications . MetaMask also lets the user create and manage their own identities , 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. https://sites.google.com/metamask-logi.com/metamask-extension/home