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How does SO's new auto-login feature work?

I've noticed that, even after I delete all cookies, Firefox Cache, Flash cache, etc. StackOverflow still knows who I am and automatically logs me in. It's a nice feature but if StackOverflow can do it, so can others. Where does StackOverflow store my login information on my computer on Firefox 3.6 / Windows 7?

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migrated from stackoverflow.com May 12 '11 at 18:42

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marked as duplicate by balpha May 12 '11 at 18:49

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I think the answer is HTML5 local storage. I don't know how it works on non-HTML5 browsers, though. –  Gabe May 12 '11 at 19:11
    
Odd that clearing the cookies in Firefox didn't work for you; in my earlier tests that worked fine in Firefox and Chrome, just not in Safari. Or did you only delete specific cookies? –  Arjan May 12 '11 at 19:30

1 Answer 1

Is it possible you are logged in with Google or Facebook or another service which is coupled to your Stackoverflow account?

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