Custom Buttons² Firefox extension buttons can be written to do various tasks that the user may require. The buttons are coded in JavaScript. Many bookmarklets can easily be converted to buttons.

Extension developers will find this extension quite useful in the development cycle. JavaScript code can be prototyped in a custombutton, avoiding the reload chrome step till the code is proven. Then the code can be moved to the extension

Good site on programming with ajax. Lots of examples and good code library to use. I like this site since it cuts thru the evangelical zealotry of many ajax sites and gives the good, the bad, and the ugly...

Code examples and links to other Ajax code sites.  Good example of popups like on the homepage...

Site with tutorials on xmlhttprequest, drag and drop, forms, uploaders, image gallery, live search, and tabbed pages.

A must page.