Several months ago when I first tried out Firefox 3, I found that I couldn’t get Firebug to work. At that time, I was still on 7.10 (Gutsy) and just rolled back to Firefox 2 and carried on about my business. Once I upgraded to 8.04 (Hardy), where its default Firefox is FF3, I tried again. I still had failures and no matter which “fix” I came across, I still was never able to open Firebug in a panel, but only in a separate window.
That all changed this morning! I was looking through packages and discovered that there is a Firebug package in the Ubuntu repos. I promptly uninstalled Firebug from the extensions settings in the Firefox and closed my browser. I went to terminal and typed:
$ sudo apt-get install firebug
… I then opened up Firefox 3 and BAM! It works exactly like it should. I have no idea what the difference is in this version of Firebug, but for whatever reason, my problems are solved.