在一个项目中要开发一个firefox的扩展，结果一直没找到好的调试方法，痛苦的要命。之前在网上找到用chromebug，试了很多次都没有成功，只好在代码里面用代码打印到控制台。
项目已经过去了很久，最近需要修改点代码，重新遇到调试的问题，在网上又搜了一遍，找到了一个方法，测试了一下，居然可以设置断点调试了，可喜可贺。
方法就是修改firefox的设置，在地址栏输入about:config，然后允许chrome调试和远程调试:
devtools.chrome.enable => true
devtools.debugger.remote-enable => true
然后在firefox里Tools > Web Developer > Browser Console.，打开调试窗口，里面有个debugger，这里就可以开始了。
以下是原文和地址
http://stackoverflow.com/questions/17547364/how-to-debug-a-firefox-extension-with-chromebug/17579253#17579253
Update April 2014: The browser debugger is now integrated in the “Browser Toolbox” and you no longer need to set about:config prefs. Just use the developer tools configuration/settings panel: “enable chrome debugging” and “enable remote debugging”. The “Browser Toolbox” will then be available in the developer tools panel.
Chromebug has not worked for me for many months. I think it’s just been silently abandoned but thankfully 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, the Web Developer menu will contain a “Browser Debugger” entry.
More info here: https://developer.mozilla.org/en/docs/Debugging_JavaScript
If possible, I’d suggest using Aurora for your debugging because the built-in debugger was a little limited when first launched and keeps getting better with every release.