Apr 28, 2009

How to spoof another browser using Firefox

This is a guide on how to make firefox look like another browser to the server you're using

If you do not have firefox download it from the link above

When you send a request to a server, all browsers send along a string similar to this:

the "User-Agent string tells the server the version of you browser and what your operating system is. This is sometimes used to determine which downloads will you be needing (ie. linux or windows version) But sometimes, you don't want the server to know what your system and/or browser is, so what do you do?

that is what this tutorial is for!

First, type about:config into your address bar.


Then it will ask for what the name of the string will be, type in:


The last step is to add what user-string you want your browser to send when it's requesting content from a server. for example, the string for google's web spiders is :

Googlebot/2.1 (+http://www.googlebot.com/bot.html)

or you can type something random in, like

none of your business

Other includes:

Wget 1.8.2:

Wget/1.8.2 modified


Mozilla/4.0 (compatible; MSIE 7.0b; Xbox-OS2) Obsidian

Xbox OS2

Mozilla/4.0 (compatible; MSIE 9.0b; Xbox-OS2) Obsidian

Xtreme Browser 0.14

Xtreme Browser/0.14 (Linux; U) [i386-en]

WordPress 1.2.1

WordPress/1.2.1 PHP/4.3.9-1

Safari 10

Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US) AppleWebKit/103u (KHTML, like Gecko) Safari/100

RealDownload 4.0.0


P3P Client

P3P Client

BlackBerry7730 3.7.1

BlackBerry7730/3.7.1 UP.Link/



WebCapture 2.0

Mozilla/3.0 (compatible; WebCapture 2.0 Windows)

wget 1.1

wget 1.1


Thank you great tutorial

It works like a charm. thank you

This is way to get wrong results from webpage. Broken margin etc.
There's reason why you send your browser information.