javascript - Firebase not getting loaded in chrome extension content script

Question

I'm trying to load Firebase inside my chrome extension's content script:

var script   = document.createElement("script")
script.type  = "text/javascript"
script.src   = "https://cdn.firebase.com/js/client/1.1.2/firebase.js"
document.body.appendChild(script)

firebaseUrl = 'https://foobar.firebaseio.com'
root = new Firebase(firebaseUrl)

But I get the error message:

Uncaught ReferenceError: Firebase is not defined 

What am I doing wrong?

Answer 1

Waitting for answers