As far as I understand Chrome's and Firefox's incognito modes mean nothing is persisted. Cookies, Offline Storage, IndexedDB, cache, everything is flushed when you exit.

Does this still leave a way (not based on IP-address nor behaviour analysis) for sites you visit to trace and de-anonymise you?

  • Try it out for yourself... – drewbenn Mar 9 '17 at 0:37
  • @drewbenn Panopticlick is largely useless for actual fingerprinting tests. It only exists to raise awareness. It is extremely limited in what fingerprinting vectors it uses. – forest Dec 5 at 2:40

In general, incognito mode isn't effective against fingerprinting. Fingerprinting looks at characteristics of your browser/system like your user agent, plugin lists, and screen resolution, none of which can be stopped by refusing to save (or clearing) data from your visit to the site (which is all incognito mode does).

With Fingerprintjs2, Chrome had the same fingerprint in incognito as without. Firefox had a different fingerprint with private browsing than without, but that fingerprint did persist after closing and reopening private browsing.

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