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Client Fingerprinting via Analysis of Browser Scripting Environment

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property in that it has date/time characteristics which are helpful in identifying the browser. Firefox 2.0.0.x uses the YYYYMMDDHH format, while Firefox 3+ uses the YYYYMMDD format. Although the resolution on the navigator.productSub is not very granular, it may not allow individual O/S variants to be identified it will most likely allow the version of Firefox to be identified.

There are two basic ways in which to customize Firefox to pretend to be a different browser; setting the ‘general.useragent.extra.firefox’ property within about:config or using a browser extension like User Agent Switcher.

Figure 5.2-2: Built-In Firefox Spoofing

Figure 5.2-3: Spoofing Browsers with User Agent Switcher

Mark Fioravanti, mark.fioravanti.ii@gmail.com

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