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https://usedapp.readthedocs.io/en/latest/core.html#useethers says
activateBrowserWallet(onError?: (error: Error) => void, throwErrors?: boolean) - function that will initiate connection to browser web3 extension (e.g. Metamask)
So, that function at least connects to Metamask. Which other extensions/wallets will this function connect to?
I wouldn't use this library. The docs are terribly out of date.
