Examine source code of Favicon Changer

{
  "manifest_version": 2,
  "name": "Favicon Changer",
  "version": "1.0",
  "description": "Change the favicon of the current webpage.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Change Favicon"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c5e2bca-b42a-48f1-9d0e-d959c815ed30}"
    }
  }
}