True, the v1 used internal API directly. They ported it to a newer API that is also used by Developer Tools. Though even today, I prefer Firebug as I really li

True, the v1 used internal API directly. They ported it to a newer API that is also used by Developer Tools. Though even today, I prefer Firebug as I really like the good UI and it has several features that are nowhere to be found in neither Developer Tools in Firefox nor DevTools in Chrome nor F12 in IE11. E.g. the "DOM" tab that let's one to view the DOM state - it's like working with Smalltalk/Squeak and its object browser window.