what is "HTTP_ALEXATOOLBAR_ALX_NS_PH"

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I was just going through the output of phpinfo() of a php file of my server. I came across a php variable called

_SERVER["HTTP_ALEXATOOLBAR_ALX_NS_PH"]

What is this variable for? What does this have to do with the alexa toolbar??

thanks

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Mirko Brunner On

This header comes from the browser extension Alexa Toolbar. This extension sniffs your traffic.