Question: Using [ColorZilla](http://www.colorzilla.com/) I found an interesting feature. If I pick a color from firefox (bars,tabs or anything else of the browser) and then go to: 

> 
> ColorZilla > Inspect Last Element > In
>  Firebug
> 
> 
> 

Then I can see the markup,css,js that firefox uses in the firebug panel just like a website.
![enter image description here](https://i.stack.imgur.com/tUFDO.jpg)

Is there any solution to view this code without use Colorzilla?

Answer: 
It sounds like you're after [Chromebug](http://blog.getfirebug.com/category/chromebug/).

> 
> Chromebug is the Firebug code adapted
>  for XUL applications. It is the
>  debugger that Firebug developers use
>  to develop Firebug.
> 
> 
> 

So you can debug your debugger, you know?

Instructions: <http://getfirebug.com/wiki/index.php/Chromebug>
There is actually a dedicated version of Firebug for that called [Chromebug](http://blog.getfirebug.com/2009/10/12/chromebug-1-5a4/) (Named after the chrome of Firefox, not Google's chrome)