the following is directly from http://greasemonkey.mozdev.org/ which is where you would go for more information and to install. You can obtain the documentation at
Greasemonkey is a Firefox extension which lets you to add bits of DHTML ("user scripts") to any web page to change its behavior. In much the same way that user CSS lets you take control of a web page's style, user scripts let you easily control any aspect of a web page's design or interaction.
For example, you could:
(To be filled in after reading documentation).
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