Just a quick one! We all know and love Firebug, but you might get annoyed when you right click to inspect element, only to find you clicked on ‘Inspect Element (Q)’ instead of ‘Inspect Element with Firebug’. So lets get rid of the one we don’t use!
It’s real easy. Browse to about:config, and proceed past the warning.
Set extensions.firebug.hideDefaultInspector to true.
Set devtools.inspector.enabled to false.