Examine source code of popup quote

{
  "manifest_version": 2,
  "name": "My First Add-on",
  "version": "1.0",
  "description": "A simple Firefox add-on",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7123a40b-c1af-4445-9157-b14ae5bd9e2d}"
    }
  }
}