Just installed it from Aurora channel. I have not used firefox for couple years now (moved to Chrome) but I think I will jump back now. The only thing in dev tools missing so far for me compared to Chrome is :before and :after pseudo elements, I love how Chrome dev tools shows it as a separate entity in the inspector tree. I hope FF team implements it as well.
Do you see the live editing of JS and on save they getting executed in a VM? I think it is pretty rad and not present in FF devtools at all. Please correct me if I am wrong.
Firebug gives you the option to toggle all pseudo states for an element and edit its CSS. IMO Firebug and Chrome's dev tools still lag behind Firebug's.
This might be Nightly only. But in the Inspector pane of the Firefox dev tools you can right-click elements to set their focus/active/hover states. Doing so will also update the pane to the right showing any state specific rules that now applies.
