FireBug is one of the best tools I have used. Web development without it wouldn’t be the same. It’s been really really good for quite a while now, fantastic even, but there has been one feature missing, an activity monitor which shows how images and files load, like Safari’s Activity Monitor. The latest version has one, and it’s sooooo much better than Safari’s, showing timings both in numbers and graphically. It also has a profiler.
What can I say, one of the best tools (rivaled only by TextMate) in my web development toolchain just got a lot better. From the top there is no way but down, but not for FireBug.
Why on earth isn’t there any tools like this for ActionScript development?