Flash Tracer for Firebug

FBTracer is a lightweight firefox extension which allows you to see the flashplayer output trace(s) in firebug panel.
Actually lines which start with “info:”, “warning:” and “error:” are automatically decorated ( see the screenshots )



  • Get the latest firebug
  • Make sure you’re using the latest Flash Player Debug version.
  • Install the plugin
  • *optional* Create a file named “mm.cfg” into the user folder ( the extension should create it ), with this content:

    For a complete list of supported option in the mm.cfg file see this post.

    • osx:/Users/{username}/mm.cfg
    • window:C:\Users\{username}\mm.cfg
  • At this point the flashlog.txt file should be automatically created the first time you visit a website with a flash inside, but it’s better to create it anyway to be sure.
  • Create the flashlog.txt file (just an empty file).
    • OSX:/Users/{username}/Library/Preferences/Macromedia/Flash Player/Logs/flashlog.txt
    • Windows: C:\Users\{username}\AppData\Roaming\Macromedia\Flash Player\Logs\flashlog.txt
  • Restart FireFox
  • Click the black arrow just near the “Flash Tracer” panel title to see and change options (and set the flashlog.txt path).


Install now fbtracer plugin for firefox.

  • Nick

    Am I the first comment? That’s surprising. I’ve been using this for ages and find it incredibly useful. Thank you very much: )

    • Nick

      After updating from firefox 3 finally and trying new version I had problems getting the output inside firebug. I think it might possibly be a firebug version problem, currently using firefox 4 and firebug 1.7 and working great.

  • Alex

    Im using Firefox 5.0, firebug 1.8.1 and the latest version of the Flash debugger.. when an error is shown on the popup box Mozilla Hangs for like 2 minutes then comes back .. sadly I can see any of the traces at Flash traces!
    I dont know, I guess its something to do with firefox 5.0? Any ideas? This would be sooo useful tu work with FB.. thankyou very much!!

    • Alex

      Uuups typo:
      .. sadly I CANT see any of the traces at Flash traces!

  • Ken

    I’m also having issues. Was working fine for me previously, but upgraded to FFox 5.0, FBug 1.8.1. mm.cfg file has not changed, flashlog.txt is filling with traces, but no output at all is shown in FBug->FBTrace window.

  • I am also having issues. I’ve set it up just as the instructions say, but nothing appears in the Flash Tracer panel. Am I missing something?

  • It seems to not be compatible with Firefox 6. Any chance of an upgrade?

  • It seems to not be compatible with Firefox 6. Any chance of an upgrade?

  • olya

    Not compatible with latest Firefox version 🙁

  • iBenny

    Hi, can this tracer diagnose (pinpoint) a Flash problem in FF ? per instance : ALL Flash video contents DO play in FF9.01/Flash11.1.102.62… except for the sound ! NO sound !? But in IE, sound do play !

  • Not compatible with latest Firefox version 🙁

  • F4x4n

    Not working….. 🙁