Public blockchains like Ethereum are the next evolution of Internet databases, and MetaMask is the next evolution of the browser.
MetaMask is a web browser extension and mobile app that allows you to manage your Ethereum private keys. By doing so, it serves as a wallet for Ether and other tokens, and allows you to interact with decentralized applications, or dapps. Unlike some wallets, MetaMask keeps no information on you: not your email address, not your password, and not your Secret Recovery Phrase or other private keys. You retain all power over your crypto-identity.
Visit
Hit "Download" in the menu bar.
Click “Install MetaMask for Chrome”. You will be directed to the Chrome Web Store.
Click “Add to Chrome”.
On the pop up, click “Add extension”.