Metamask asks for permissions to
Read and change your data on all eth sites and all test sites
What is 'an eth site'? Is it a site with
eth in its URL?
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This extension declares following permissions in its
["storage","unlimitedStorage","clipboardWrite","http://localhost:8545/","https://* .infura.io/","activeTab", "webRequest", "*://*.eth/","*://*.test/","notifications" ],
So, it requires access to all .eth and .test websites. TIL .eth is a TLD, just like .com or .org.