Private browsing. Incognito. Privacy mode.

Web browser functions like those trace their roots back more than a decade, and the feature — first found in a top browser in 2005 — spread quickly as one copied another, made tweaks and minor improvements.

But privacy-promising labels can be treacherous. Simply put, going "incognito" is as effective in guarding online privacy as witchcraft is in warding off a common cold.

[ Related: Get serious about privacy with the Epic, Brave and Tor browsers ]

That's because private browsing is intended to wipe local traces of where you've been, what you've searched for, the contents of forms you've filled. It's meant to hide, and not always conclusively at that, your tracks from others with access to the personal computer.

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