You can change the entire layout of the website by modifying the existing source code to see a live effect on the screen. This does not change the site permanently, it only gives you a visual reference to what it would look like if it were changed that way.
Firebug is free and open source, licensed under the BSD license. Firebug was initially written by Joe Hewitt, one of the original Firefox creators. The Firebug Working Group oversees the open source development and extensions of Firebug. Approximately 1.7 million users have Firebug installed as of Oct. 2009 .
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