Examine source code of Create a Google Drawing™

{
  "manifest_version": 2,
  "name": "Create a Google Drawing™",
  "description": "This extension creates a new Google Drawing™",
  "version": "0.2",
  "author": "Thomas Hammerlund",
  "icons": {
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": "images/icon128.png",
    "default_title": "Create a Google Drawing™"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}