Module: browser fingerprint

Summary

• Objective: Fingerprint browser version by checking presence of browser images
• Date: Septembre 2011
• Authors: bcoles
• Browsers: IE, Safari, Firefox
• Code

Internal Working

The module include a database of pictures accessible internally by the browser :

var fingerprints = new Array(
    new Array("Safari","1+","feed://__rsrc__/__rsrc__/NextPage.tif"),
    new Array("Firefox","1+","moz-icon://.autoreg?size=16"),
    new Array("Firefox","2","resource:///res/html/gopher-audio.gif"),
    new Array("Firefox","2-3","jar:resource:///chrome/classic.jar!/skin/classic/browser/Secure.png"),
    new Array("Firefox","4-5","resource:///chrome/browser/skin/classic/browser/Secure.png"),
    new Array("Firefox","1-6","resource:///chrome/browser/content/branding/icon128.png"),
    new Array("Firefox","4+","resource:///chrome/browser/skin/classic/browser/Geolocation-16.png"),
    new Array("Firefox","7+","resource:///chrome/browser/content/browser/aboutHome-snippet1.png"),
    new Array("Firefox","8+","resource:///chrome/browser/skin/classic/aero/browser/Toolbar-inverted.png"),
    new Array("Internet Explorer","5-6","res://shdoclc.dll/pagerror.gif"),
    new Array("Internet Explorer","7+","res://ieframe.dll/info_48.png")
);

The module load each picture and check whether the load succeeded or failed.

Screenshots

Feedback

• Firefox 15: 1+,4+,8+
• IE6: IE 5-6