MetaMask Extension is fully safe for the users to keep their crypto assets. They just need to stay cautious while using the wallet and perform security activities as well.
As your guide, we cannot provide you with all the specific details related to the Trezor.io start, what we can do is provide you with the information on general topics:
MetaMask Extension is a trusted crypto wallet used by more than 30 million people worldwide, with security features like encryption, Blockaid, and seed phrases.