Firefox tools
JS debugger
https://update.mozilla.org/extensions/moreinfo.php?application=firefox&id=216&vid=512

Live HTTP headers
http://livehttpheaders.mozdev.org/installation.html

irt.org (http://www.tech.irt.org/articles/script.htm)
JavaScript Kit (http://javascriptkit.com/)
SearchScript (http://scriptsearch.internet.com/JavaScript/)
DHTML model (http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/dhtml_node_entry.asp)
JScript (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/jscript7/html/jslrfJScriptLanguageReference.asp)
Netscape devedge (http://devedge.netscape.com/central/javascript/)
Industry standard naming conventions - http://countygovt.brevard.fl.us/is/webdevguide/codingstandards/javascript/jsguide.htm
Clearcase cheatsheet - http://www-106.ibm.com/developerworks/rational/library/836.html
Extending JS classes - http://phrogz.net/JS/Classes/ExtendingJavaScriptObjectsAndClasses.html
DOM quick reference from JS bible - http://www.dannyg.com/ref/jsquickref.html
JS reference with browser compatibility for standard JS objects - http://www.w3schools.com/js/