List all plugins installed in FF

Get computed Height of an HTML Element

Flexible sorting algorithm based on Quicksort with extra functionality, such as:
- Direction (ie: ascending or descending)
- Sort-by-path (eg: item.name, item.name.firstName or item[5])
- Sorting function (returns true if two items are already sorted)
- Type checking
- All constants and support functions are members of the Sort() function
- Testsuite with hooks for cscript and in-browser javascript, so you can tweak and optimize, and make sure it still works
- Environment agnostic (can use with, say, SpiderMonkey or .Net's jsc)

Here's a library to manage CSS class names on DOM elements.

Simple chatting script to be placed on a corner of a website
Also a good example how to use ajax.

Set a word or phrase in an input field, clear it onfocus

It works with Array types. The example is a simple list of numbers, but the array could contain anything; lists of strings, functions, DOM nodes, whatever. Unfortunately, a lot of things that seem like arrays in the DOM aren't really, so you can't shuffle the images on a page with just document.images.shuffle() all by itself.

Delete a Cookie

Trim , Left trim (ltrim) and Right Trim (rtrim) in javascript

I found this to be a neat little trick for hiding(somewhat) source javacscript code from peering eyes...

This function will unload all linked javascript files so that when you view source - you see no javascript files! (Especially helpful when using FF and using web-developer tools - no linked js files are displayed) The files remain resident in memory - allowing for the functions to work.

Just call the function in the tag