When I reach Instagram user pages while in Incognito mode, Chrome pops up a window with my non-incognito username asking whether or not to sign in. See screenshot below. Although I assume Chrome Incognito isn't broken and sharing this information with Instagram - I do wonder how Instagram caused this dialog to show. It is a bit intrusive and I would have preferred if Chrome didn't do this. I've also never seen it anywhere on the internet, so it is a bit of a head scratcher. How'd they do it?

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  • Being able to use saved pw in incognito is a feature not a bug (as look as it's never done w/o user input).
    – curiousguy
    Jul 5, 2019 at 0:55

1 Answer 1


Instagram can't, and isn't, doing that. Chrome is. Chrome knows your Google account because you've signed in to it, and they know that you have your Instagram credentials saved in your Google account, so when you visit the Instagram website, they offer to sign in automatically for you. I don't know why this would trigger in Incognito mode; that seems like a possible bug. This is by design, apparently. I find this a bit worrying.

This popup isn't disableable as far as I can tell. You can only control whether sign-in occurs automatically, or requires a prompt ("Auto Sign-in" in chrome://settings/passwords). If you're getting the prompt, it means you've disabled auto sign-in; that's as good as Chrome will give you, unless I'm missing an additional setting.

  • No other site exhibits any behavior like this. So I have to assume Instagram is doing something to cause it. Jul 3, 2019 at 22:02
  • According to this bug report, this is by design. Chrome will offer to sign in with saved credentials while in incognito mode.
    – AlphaD
    Jul 4, 2019 at 7:26
  • @ubershmekel Yes, Instagram and some other services basically say "Browser, if your user has credentials, ask them to log in." Chrome then displays this dialogue to you. Instagram does not get any information about credentials unless you log in with them.
    – user163495
    Jul 4, 2019 at 9:38
  • The reason why Chrome offers this is because people have a wrong perception of incognito mode. The idea is that things you do in incognito mode should not affect the "regular browsing", such as creating cookies, browser history, etc. The normal browsing can (and does) affect browsing in incognito mode.
    – user163495
    Jul 4, 2019 at 9:39
  • @ubershmekel I've seen this same behavior on many sites, and this is the reason it happens. This is the correct answer. Jul 4, 2019 at 11:20

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