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Introduction to Greasemonkey: Transform Your Browsing Experience with User Scripts

Greasemonkey is a powerful Firefox extension that allows users to install scripts that alter web pages in real-time. These user scripts can enhance functionality, fix bugs, or remove unwanted content. With a simple installation process, scripts must end with the “.user.js” file extension. Each script includes a metadata section to provide information to Greasemonkey. Additionally, the extension supports a variety of APIs for logging, storing values, and making HTTP requests. Discover useful links and get started with scripting today!

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Introduction to Greasemonkey: Transform Your Browsing Experience with User Scripts

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  1. Introduction To Greasemonkey

  2. What is Greasemonkey? • A Firefox extension which allows a user to install scripts which will alter a web page on-the-fly. • Useful for adding new functionality, fixing bugs, removing unwanted content, etc.

  3. User Scripts • Greasemonkey on its own doesn’t do anything. A user script must be installed in order to alter page content. • A user script must end in the “.user.js” file extension. • A user script can be installed via the Tools->New User Script menu item or by browsing to the script in Firefox.

  4. User Script Metadata • Each script has a metadata section to tell Greasemonkey about itself. // ==UserScript== // @name TestScript // @namespace tag:hci.ucsd.edu,2001-06-05:ex // @description A Test script // @include http://hci.ucsd.edu/* // ==/UserScript==

  5. GM API • Greasemonkey also supports some additional API in addition to JavaScript • GM_log – log messages to JavaScript Console • GM_getValue – get script specific config value • GM_setValue – set script specific config value • GM_registerMenuCommand – add a menu item to the User Script Commands submenu • GM_xmlhttpRequest – make an arbitrary HTTP request

  6. Lets Install Some Scripts • Hello World // ==UserScript== // @name TestScript // @namespace tag:hci.ucsd.edu,2001-06-05:ex // @description A Test script // @include http://hci.ucsd.edu/* // ==/UserScript== alert(“Hello World”);

  7. Useful Links • http://greasemonkey.mozdev.org • http://diveintogreasemonkey.org • http://dunck.us/collab • http://greaseblog.blogspot.com • http://www.oreilly.com/catalog/greasemonkeyhks

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