When users visit a website matching a script in their personal script library, Greasemonkey invokes the relevant scripts. Greasemonkey scripts can modify a webpage in any way that JavaScript allows, with certain Greasemonkey security restrictions.
“Greasemonkey is a Mozilla Firefox extension that allows users to install scripts that make on-the-fly changes to web page content after or before the page is loaded in the browser”
Greasemonkey is a Firefox extension that allows you to customize the way webpages look and function. Hundreds of scripts are already available for free. And if you're the tinkerer sort, you can also write your own.
Greasemonkey is an extension for the Firefox browser that allows users to write or install scripts that change the functionality of a website. The scripts are executed every time a website is loaded, so Greasemonkey could be used to permanently alter a us
