It's not even "Incognito" (what a misnomer too), this is a Gecko-based browser

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[+] -26 points 3 years ago

Cookies fall short just the same as sessions. you're asking the user to pinkie promise they won't clear their cookies / modify them.

An account seems the most logical. You need to avoid duplicates ; it's not really about privacy here. You'll only make a tradeoff between accomplishing no duplicates and letting users do what they want.

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