Thanks to Tona (and her student Chris), I've installed Chris Pederick's excellent Web Developer Extension for Firefox (also available for Mozilla).
It adds a new toolbar to my browser, with a slew of useful tools--from quickly displaying and tweaking a document's CSS to running validator and accessibility checks. One of the coolest features is its ability to outline elements on a page...so you can see all the block elements, for example, or all the frames. Extremely useful for me when grading student projects, and even more useful for showing underlying structure when teaching.
Very cool. I am overwhelmed by the sheer number of features. =)
Oh, now THAT's useful! I love being able to tweak the CSS of a site on the fly, without saving or opening files! and then I can save it if I like. Thanks!
WOW - I am impressed. A tool like this would have saved me a lot of time a couple months back. Thanks for the link!