Tess - you really do ask the best questions. Thank you for starting the thread and everyone else for sharing.

I can't live without some of the Firefox add-ons:
AutoPager - autoloads the next page - so you just keep on scrolling
Google Preview - inserts web site previews in Google & Yahoo search results
Palette Grabber - creates a color palette for the current page for graphic design applications
JSView - view the source code of external stylesheets and javascripts
WebDeveloper gives a whole raft of features including window resizing, screen ruler etc etc

_____________________
Denise - Your Organisers