I like FF dev tools a lot, yet there is some stuff there that could be better:

- no call stack(?)

- breakpoints are a bit of a hit or miss, especially when callbacks are involved.

- http request monitoring is a bit messy - you see the request in the console, you can click on them, but the resulting dialog box only offers basic info, without even an option to go to the clicked url directly. In network panel the functionality is completely different for some reason. Fortunately mostly fine, but one irritating thing is that response view is so little and you cannot make it much wider.

But anyway, they're improving greatly, only a couple of months back you couldn't even think about not using Firebug in FF. So kudos to them for all the hard work.