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RE: Adding Supervisor Tab to Utopian Moderator Chrome Extension!
I thinks that is a bug for Chrome browsers.
https://bugs.chromium.org/p/chromium/issues/detail?id=57370
but form reading that I'm going to guess that you are on Windows with non-english locale set.
Actually, I restarted Chrome and tried to install it again, and now it installed cleanly. That's good enough for me.