MetaMask is a browser plugin, available as the MetaMask login Chrome extension or Firefox Add-on. At its core, it serves as an Ethereum wallet: By installing it, you will get access to a unique Ethereum public address, with which you can start sending and receiving ether or tokens.
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Charter Email has been rebranded and it is know marketed as Spectrum login Webmail. The domain charter net was kept so that existing clients can access their emails..