[gonchuki]

add to that list that the Chrome dev tools don't display errors in red in the network tab. A 200 next to a 404 is nearly to impossible to distinguish at first sight (basically, if you are looking at the name of the file, you are not looking at the response code at the same time.)

Every time I use the dev tools I find them lacking a lot of UI/UX details that Firebug had there forever.

Being unable to quickly switch between the CSS and Layout/Metrics view is another major downer. Tabs beat scrolling, always.