Just made this up for work, thought others might find it useful.
Check back tommorrow for my other extensions you need.
JavaScript debugger
http://getahead.ltd.uk/ajax/venkman
Web developer toolbar
http://chrispederick.com/work/webdeveloper/
Console2
http://forums.mozillazine.org/viewtopic.php?t=318102
update notifier
http://www.longfocus.com/firefox/updatenotifier/
Sections