MetaMask is more than just an Ether wallet. It's an Ethereum Browser, like Mist! It allows you all the same functions, features and ease of access from regular Ethereum Wallets, and it allows you to interact with Dapps and Smart Contracts, and all without the need to download the blockchain or install any software, you can just install it as a Google Chrome Extension! Plus, it has a cool fox logo that follows your mouse around, which made us smile. So, let's get started with MetaMask.
See official metamask website here
Step 1: Click here go to the Chrome Webstore and get the MetaMask plugin
Step 1: Click here to add metamask plugin to firefox
Step 2: Click "Add to Chrome" to Install MetaMask as Google Chrome extension.
Step 3: Click "Add Extension" to confirm and MetaMask will be added
You can see that MetaMask is added by the little fox logo that shows up on the top right corner
Step 1:Click the MetaMask logo at the top left of the chrome browser.