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Bounty: currently MetaMask is throwing errors in the Tor browser that prevent the extension from loading. To fill the bounty, get MetaMask's most recent version (4.8 at time of writing) to work in Tor.
MM is successfully installed, but when I click on the MM icon, the small window shown is completely empty.
Tor 7.5.6, Metamask 4.8.0.
Screenshots are bellow: