How can I debug a Firefox extension with Firebug?

Question

I\'m trying to use Firebug to debug a JavaScript file in an extension I\'ve added to Fx 4.
Can anyone tell me how to do it? I can only see website scripts.

Answer 1

On Firefox 19 or later, it's possible to use the built-in JS debugger on the browser itself. Go to about:config and set the following two prefs:

devtools.chrome.enabled: true
devtools.debugger.remote-enabled: true

After you restart the browser, you can access the Browser Debugger through Tools > Web Developer > Browser Toolbox.

(note that you must accept the incoming connection)

See more at: https://developer.mozilla.org/en-US/docs/Mozilla/Debugging/Debugging_JavaScript#JavaScript_Debugger