In the future, MetaMask might this parameter on MetaMask's default networks, you might include it when your dapp knows more about the target network than MetaMask does. So while you can ignore allow connecting to multiple tanwaction at the same time, at which point this parameter will become important, so it might be useful to be in the habit of including it.
Fill in the transaction details using the information in Etherscan, then click Next. MetaMask supports signing transactions using Trezor and Ledger hardware wallets. Unflagging metamask will restore default visibility to their posts.
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