Examine source code of Khan Academy Learning

{
  "manifest_version": 2,
  "name": "Khan Academy Learning",
  "version": "1.0",
  "description": "Quick access and save favorite courses from Khan Academy.",
  "permissions": [
    "storage",
    "activeTab",
    "https://www.khanacademy.org/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Khan Academy Integration"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{95b57e72-4558-4b1a-9bd5-fdde510b4858}"
    }
  }
}