This is the first time I encountered similar thing. When I log into the Twitter web site in Chrome (namely, the Iron version which is said to be security enhanced, but that does not matter here) in private browsing mode it automatically logs me into my Twitter account in the main browser window as well.

  • Is it a feature of Twitter?
  • Or a bug of Chrome?

This can be very embarrassing, indeed.

Other web sites or other browsers are more secure regarding this issue? Is it possible that one of my add-ons leak? I only have Alexa and HTTP Everywhere. This would be very dangerous.

In 2010 August the following news circulated through the tech media: Private browsing modes leak data

Edit: I just replicated the same error on a freshly installed Google Chrome on a freshly installed Windows 7. The culprit is the HTTPS Everywhere add-on.

  • Can't replicate this in my chrome install (normal v28)
    – JimL
    Commented Aug 1, 2013 at 10:15
  • I don't see the issue. Isn't private browsing mode designed to prevent additive behaviour, rather than act as a blank slate? Your previous non-private session cookies will still be accessible in private mode, but new ones will not be stored beyond the private session.
    – Polynomial
    Commented Aug 1, 2013 at 10:44
  • AFAIK Iron isn't really any better than pure Chromium. It simply changes the default value of some settings. Commented Aug 1, 2013 at 10:55
  • I see you have answered your own question. Please add and mark it as an aswer. Do note that you use a non-standard Chrome/Chromium
    – BlueCacti
    Commented May 23, 2014 at 11:35

1 Answer 1


This is not a feature in Twitter or the Chrome version you're using. It's either a bug in the browser or a misconfiguration on your side.

Please refrain from using non-standard and non-official browsers. Instead of using SRWare Iron (a fork of Chromium), you should use Chrome, which can be easily configured to reach your privacy goals.

  • What makes a browser "official"? (I think the word you want is reputable.)
    – TRiG
    Commented Jun 29, 2015 at 15:53

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