I'm on Firefox 56, but I believe Firebug worked in 55 still. The performance of Firebug fire exceeded the native browser tools. The inspector tool in Firebug

I'm on Firefox 56, but I believe Firebug worked in 55 still. The performance of Firebug fire exceeded the native browser tools. The inspector tool in Firebug was damn near instant to allow me to select an element in the browser. Firefox's version of the inspector can take upwards of 5 seconds sometimes to become "ready". Side note... I'm on a 7 year old macbook air, so the differences are very notable.