So I made a quick test to see how much was hard to create a new panel inside firebug to display flash tracer.
This is the result of what I did right now. It does not have all the features of the old extension, it just display the flash traces. Anyway it is actually in early stage development, updates will come during next days.
Here the instructions and the download link (remrmber to install the flashplayer debugger and firebug first!):
P.S. It has been tested on osx snow leopard and Physic Homework Help windows 7 right now.