Trezor.io/start is a web address that likely leads to the starting point or setup process for using a hardware cryptocurrency wallet offered by Trezor. Trezor is one of the most reputable and widely used hardware wallet manufacturers in the cryptocurrency space.
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MetaMask Extension is a popular browser extension that enables users to interact with the Ethereum blockchain and Ethereum-based decentralized applications (dApps) directly from their web browser. Initially developed as a wallet for the Ethereum blockchain, MetaMask has evolved into a comprehensive tool for accessing the decentralized web.