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IMO, ERROR: PLEASE INSTALL METAMASK TO USE THE BUTTON makes the contract meaningless.

Good point, I'll change the message. MetaMask is a common browser extension which allows you to interact with Smart Contracts on the web. Other alternatives are Mist, Parity, or myetherwallet.com

Yeah, this seems like a ploy to get people to install some shady browser extension.

It's a well known extension with Ethereum users.

https://github.com/MetaMask/metamask-extension

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