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nytimes detecting Private Mode

Posted

I updated to Firefox 66 on Linux yesterday. I don't know if it's the browser version, but I noticed that nytimes.com started picking up that I'm browsing the site in private mode.

Interestingly, this is something that used to happen on my Chrome book when I used private mode, but this on Firefox, this is a first for me. It may well be that nytimes changed their code to do this, but I wonder upgrade to FF 66 contributed to this.

In any case, I wonder how a site can pick up if the user is browsing in private mode.

I updated to Firefox 66 on Linux yesterday. I don't know if it's the browser version, but I noticed that nytimes.com started picking up that I'm browsing the site in private mode. Interestingly, this is something that used to happen on my Chrome book when I used private mode, but this on Firefox, this is a first for me. It may well be that nytimes changed their code to do this, but I wonder upgrade to FF 66 contributed to this. In any case, I wonder how a site can pick up if the user is browsing in private mode.
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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

More Information

WestEnd
  • Top 10 Contributor
60 solutions 5232 answers

PB if detected by the site might now let you access since they sometimes require tracking or cookies to work.

PB if detected by the site might now let you access since they sometimes require tracking or cookies to work.

Modified by WestEnd

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jscher2000
  • Top 10 Contributor
8434 solutions 68823 answers

Helpful Reply

In private windows, Firefox disables saving data to disk using IndexedDB, so that is one possible characteristic sites might use.

In private windows, Firefox disables saving data to disk using IndexedDB, so that is one possible characteristic sites might use.
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jscher2000
  • Top 10 Contributor
8434 solutions 68823 answers

Helpful Reply

There was a thread on Reddit recently: https://www.reddit.com/r/firefox/comments/b0c5ea/preventing_incognito_mode_detection/
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Question owner

Thanks.

A 7-years-old bug!

Thanks. A 7-years-old bug!
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