I think what you wanted to know was about the Metamask addon. For engaging with decentralised applications (dApps) on the Ethereum blockchain, Metamask is a well-known browser extension that acts as a virtual wallet. Users can engage with different Ethereum-based tokens, save and send ether (ETH), and manage their Ethereum accounts. Your Ethereum accounts are kept Metamask Extension in a safe digital wallet called Metamask. You have complete control over your money because it generates and saves your private keys locally on your smartphone.