Greasemonkey is a Mozilla Firefox extension that allows users to install scripts that make on-the-fly changes to most HTML-based web pages. As Greasemonkey scripts are persistent, the changes made to the web pages are executed every time the page is opened, making them effectively permanent for the user running the script.
Greasemonkey can be used for adding new functionality to web pages (for example, embedding price comparison in Amazon.com web pages), fixing rendering bugs, combining data from multiple webpages, and numerous other purposes. Well-written Greasemonkey scripts can integrate changes so well that their additions appear to be natural parts of the web page.
Greasemonkey for Users
Firefox Required
Once you have the Greasemonkey addon installed, there's a heap of scripts that you can get to improve your daily web browsing experience.
- Get Greasemonkey Addon from Mozilla.
- Browse the directory of User Scripts.
- If you need help, read the Greasemonkey Manual
My User Scripts
Here are a few user scripts that I have created:
- Squidoo Workshop Addon for Firefox
- This adds extra features to the Lens Workshop and a few other pages on Squidoo. The most significant improvements are: large text boxes, colored tags, detailed stats, integrated ping and improved support for Groups.
- Cleaner SquidU
- Tidies up the SquidU Forum interface, and adds highlighting.
- Twurl Link Info
- Shows information about all Twurls found when on Twitter.
Other Good Scripts
I have found a few scripts that have proved to be quite useful:
- Google Reader - Colorful List View
- Colorizes the item headers in Google Reader list view
- Intercepter
- In twitter.com: replace short and meaningless tinyurls with the domain of the actual web site using tinyurls' preview feature.
- Twitter Hashtags
- Adds links to hashtags.org or twemes.com to tweets on twitter.com
Greasemonkey for Developers
You can use Greasemonkey to build your own personal scripts, or as an alternative to making a stand-alone plugin. If you already know Javscript and modifying the DOM tree, then writing your own scripts will be easy to do.
- Greasepot - the official blog and homepage for Greasemonkey.
- GreaseSpot Wiki is community documentation for user scripting with Greasemonkey.
- Get started with the Editing Scripts section of the manual, as well as the Greasemonkey API.
- There's also Dive Into Greasemonkey (rather old material).
Blog Posts from Greasespot
- Greasemonkey Release 0.8.20090123.1
- In preparation for Firefox 3.1, we're releasing a new version of Greasemonkey, marked as compatible with Firefox 3.1b2, along with additional changes and fixes: Added translations: ar-SA, bn-IN, hu-HU, id-ID, ro-RO, sr-RS, vi-VN. ...
- Greasemonkey Version 0.8
- At long last, the new version of Greasemonkey is available. Get Greasemonkey 0.8.0 from addons.mozilla.org. The most important change for this release is full compatibility with Firefox 3.0. There is also a new feature that allows ...
- Greasemonkey Security Update
- I've just posted an update to Greasemonkey that fixes a recent publicly disclosed security issue. Please upgrade to the latest version as soon as possible. Note that this update might affect compatibility for a small number of scripts. ...
- Greasemonkey 0.7 Candidate
- Hello all, Since there were some pretty major problems with the last release that caused significant grief, I've rethought how releases will work. Going forward, we will: Do candidate releases to greasemonkey-dev and greasemonkey-users. ...
More Firefox
-
Squidoo Dashboard Firefox Extension
-
The dashboard shows a basic set of information to the Squidoo user, but is this enough? The Squidoo DE will enhance Firefox to show even more information on the dashboard.
-
The Best Firefox Addons and Plugins
-
These are super useful addons and plugins for the Best Browser Ever; Firefox. Now you can install the even better Firefox 3!
-
Google Chrome or Mozilla Firefox?
-
Which is better? Google Chrome or Mozilla Firefox? Right, you've had plenty of time to download and install Google Chrome so now, you must have a pretty good idea of how it works and whether you prefer it over Mozilla. So, no more pussy footing aro...
by thefluffanutta
(more) 
