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Does Private Do Not Track (DNT) enable in popular browsers?

I found many requests in web server logs from different browsers (IE, Firefox, Chrome) with a Do-Not-Track header .

I suspect that these users did not manually enable Do-Not-Track, because this, in my opinion, is not a popular and well-known user setting, but rather that it is available to them when they use the “private mode” of each browser, .

So does "private mode" actually do-not-track? on popular browsers

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I quickly tried to enable private DNT browsing (i.e. includes the DNT: 1 header) when "do not track" was not yet enabled in the settings.

  • Firefox 39 (Android): no
  • Firefox 41: no
  • Chrome 43 (Android): no
  • Chrome 45: no
  • Opera 12.16: no
  • Internet Explorer 11: yes
  • Safari 6/7 (Mavericks): yes (according to docs )
  • Safari 8 (Yosemite): yes (according to docs )
  • Safari 9 (Yosemite): yes (OP tested, Safari 9.0 (10601.1.56.2))
  • Safari (iOS): yes (implies docs )
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