How To Change User Agent in Mozilla Firefox

If you want to change Firefox’s User Agent there is a way to do it.

Type in your browser, in the address line, about:config and you will see a full list of the variables used. Now, type useragent in the filter line and search a string identified with general.useragent.override (to modify this line just double click the entry and make your changes).

User agent value can be specified in the defaults\pref\all.js file by adding the “general.useragent.override” property, as in this example:

pref( “general.useragent.override”, “Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)” );

There is a more easily way to change User Agent. Get a User Agent Switcher and will run on any platform that these browsers support including Windows, Mac OS X and Linux.
Common User-Agent Values

Googlebot/2.X (http://www.googlebot.com/bot.html)
The Google Web crawler.

Mozilla/3.0 (Win95; I)

Netscape Navigator 3.0 on Windows 95.
Mozilla/3.01 (Macintosh; PPC)
Netscape Navigator 3.01 on a Macintosh.
Mozilla/4.0 (compatible; MSIE 4.01; AOL 4.0; Windows 98)
The AOL browser, based on Microsoft Internet Explorer 4.01, on Windows 98.
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
Microsoft Internet Explorer 6.0 on Windows 2000.
Mozilla/5.0 (compatible; Konqueror/2.2.2; Linux 2.4.14-xfs; X11; i686)
Konqueror 2.2.2 for Linux.
Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.2) Gecko/20010726 Netscape6/6.1
Netscape 6.1 on Windows 98.
Opera/6.x (Windows NT 4.0; U) [de]
The German version of Opera 6.x on Windows NT.
Opera/7.x (Windows NT 5.1; U) [en]
The English version of Opera 7.x on Windows XP.

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