If anyone want to use any extension just like metamask as a alternative of it, than Math wallet extension is a great as it's support multi-blockchain. Just like math wallet, a new projects just launched which is Clover and developer develop their extension for interacting with multi-blockchain and it's also available on chrome web store. I used both of these wallets and users who use brave browser, can use the "Crypto Wallet" which is the default built-in metamask with attractive UI.