Last night I had to do some work on the CREATE South website, fixing problems making it render funny on Internet Explorer. The first thing I did when I sat down to start was to google on what Firebug like things there are for IE. To my shock and pleasant surprise, you can get a simulacrum of Firebug on any browser via Javascript. It’s called Firebug Lite and it worked great.
I set up the bookmarklet that will inject Firebug javascript into the current page, and from that point on you have something very similar to the Mozilla plugin right there. I wasn’t doing hardcore debugging in Javascript like I have found Firebug to be so useful for, but it helped me sort out some mismatched <div> tags and showed me where the problems were. I had no inkling before last night such a thing existed, but wow is it awesome and useful!