Call it a case of bad advertising I will. In the line of work that I’m in, I can’t help but feel this way. :/
In my opinion, FlashTracer was the best thing that happened in Flash development on the browser. However, ever since I upgraded to Firefox 3, I landed myself in pain. FlashTracer was no longer working for the new version of Firefox, and umpteen checks on the addon page yielded no updates.
I was disappointed (and was still in much pain).
Only recently did a friend of mine tell me that there _was_ an update for FlashTracer for Firefox 3, which was available _way back_ in July. Shocked and stunned by my blindness, I asked him why I couldn’t find it on the FlashTracer addon page. It was then that he told me that I have to google it~ :S
Well so, here it is, FlashTracer v2.3.1 (saving you from the extra step of searching). 
I’m not surprised if there are still people out there who aren’t aware of this, so help spread the word!
Unfortunately not working with FF 3.03… the story continues
I can’t make it work with FP10
after downloading the newest version of flashtracer from:
http://www.sephiroth.it/firefox/flashtracer/
in flashplayer 10 you need to create a file named mm.cfg in folder:
WIN XP: C:\Documents and Settings\{user}\
copy the next 2 lines to mm.cfg
ErrorReportingEnable=1
TraceOutputFileEnable=1
now the flashlog.txt file will be created on next start of firefox 3 automatically
hope that helps!
Josh, for me it still doesn’t work. Can you send me an email with a possible fix please?
i have firefox 3.0.1 tried all of the above still could not get this plugin to work. i just gave up on it