My browser is configured with several cookie restrictions (clear cookies on exit, no third party cookies, and privacy badger on top of that). I found that after SE recently switched to a new authentication architecture my credentials are not saved between one navigation session and another, despite the addresses of the SE sites I regularly visit being whitelisted.

So, in which cookies does the new authentication architecture store credentials? What sites do I have to whitelist to be able to stay logged in?

  • I don't think they ever used cookies, it always was local storage. Commented Aug 9, 2015 at 14:14
  • @ShadowWizard I see that stack exchange does store two local storage keys (nuCounter and se:fkey), but they are correctly preserved across sessions, so that does not seem to be the issue. Commented Aug 9, 2015 at 14:23

1 Answer 1


Based on some experiments and code I have to log me in without using a browser seem to prove that the only cookie you need per site is the acct cookie from the domain .stackexchange.com:

acct cookie in Dev Console

Removing that cookie logs you out immediately and the toolbar switch to the anonymous state when you refresh the page.

  • Thanks! I still have to understand which extension is responsible, but it seems like the auth cookie for stackexchange.com gets saved only when I start Firefox in safe mode. :/ Anyway everything is fixed now. Commented Aug 9, 2015 at 15:33

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