New JavaScript Updates in Firefox 3
John Resig has written an article outlining the updates to JavaScript in the latest version of Firefox - Firefox 3. This version is still in Alpha stage. The major points are...
clientLeftandclientTopare now supported- You can hide cookies from JavaScript(XSS protection)
- Offline Coding Support
- RegExps have a new /y flag
Unfortunately, no matter how cool the new updates, we will not be able to use it until, say, 2010. This is because the other browsers will only catch up with the changes then. Another factor is that many users will still be using the older versions.
I have still not started using the new stuff in Firefox 2 - like Array.map, Array.every, etc. More about JavaScript 1.7 - introduced in Firefox 2.

Comments
>>we will not be able to use it until, say, 2010.
Feel reasonably safe in using them, since IE supports them, too. At least Firefox automatically updates itself.
IE invented these properties (clientLeft, clientTop, offsetLeft, offsetTop, offsetWidth, offsetHeight) and has supported them since IE 3 or 4, many years ago.
There was no public standard that did the same thing, so Firefox copied IE.
a, strong, em, b, i, code, pre, pandbrallowed. Other tags will be shown as code(< will become <). Urls, Line breaks will be auto-formated.