Examine source code of IdentFavIcon Quantum

{
  "manifest_version": 2,
  "name": "IdentFavIcon Quantum",
  "short_name": "IdentFavIcon",
  "description": "Automatically generated favicons for sites without one.",
  "version": "1.2resigned1",
  "author": "Wolfgang Faust",
  "homepage_url": "https://www.github.com/wolfgang42/identfavicon-quantum",
  "icons": {
    "48": "icon/identfavicon-quantum-48.png",
    "96": "icon/identfavicon-quantum-96.png"
  },
  "permissions": [
    "tabs",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0289626e-fd24-4afc-bf41-fa946c4a5c93}"
    }
  }
}