MetaMask Chrome is a browser extension that allows users to interact with decentralized applications on the Ethereum network. Beacon Chain, on the other hand, is the proof-of-stake blockchain of Ethereum 2.0, providing security and scalability for transactions in the Ethereum ecosystem.
https://sites.google.com/metsmask.com/metamaskchrom/home
https://sites.google.com/beaconchas.com/beaconchainn/home