How can I disable firebug using Javascript? I want to do this to hide the workings of my webpage from visitors. Is there any option to do this?
You can't. The best you can do is obfuscate your JavaScript.
Actually scratch that. The best you can do is move all the security-critical code to the server. You should be doing that anyway.
You can't do it. Check this stackoverflow question on different methods others have adopted as a work around of sorts
As Amadan said, you can't disable particular source-viewers.
But you can use a hack. It works only with viewers, that add them selves to the DOM. You just have to delete specified node. Did a look-around with Firebug Lite for Chrome. DON'T use this approach, only for fun :)