Question : livehttpheaders.mozdev.org legitimate site or not?

When I went to the following site to d/l "live httpheaders", my AVG Anti-Virus program gave me the prompt below. It also gave a prompt saying the threat was blocked and named the threat "Exploit Rogue Security Threat Analysis (type 1007)". Problem is, that both prompts popped up underneath the browser and I installed the Firefox plugin. It was only after doing so and closing the browser that I found the notices.

Does anyone know if the site I went to is a legitimate firefox/mozilla site? I'm hoping that AVG is giving me a fale prompt re this!

http://livehttpheaders.mozdev.org/installation.html#

Danger: AVG Active Surf-Shield has detected active threats on this page and has blocked access for your protection.

The page you are trying to access has been identified as a known exploit, phishing, or social engineering web site and therefore has been blocked for your safety. Without protection, such as that in the AVG Security Toolbar and AVG, your computer is at risk of being compromised, corrupted or having your identity stolen. Please follow one of the suggestions below to continue.

URL: www2.yourprotection86.co.cc/?p=p52dcWpla2qHjsbIo22AgXOOipnVbWGWZInT1m6uqG2Lw8ydb5aYen5arK3NasiXkmRebGholGOaVqPajtfZ1m5oWKeih9eipqCecV6aoaXGaorcmpWkcVih1GqYaF6XYZeSlGdvYGedlImrl5p2nKyoqHOQXNDLpaOanaCskpDRnV%2BModahlGNua2ielJVyZlqtp2pxaWuYZpafZGJmaFibx2qlcV
Name: Rogue Security Threat Analysis (type 1007)

Answer : livehttpheaders.mozdev.org legitimate site or not?

I believe it's a legitimate page but I got my copy from here: https://addons.mozilla.org/en-US/firefox/addon/3829/