Examine source code of Joke-app

{
  "name": "Joke",
  "description": "Random joke browser extension",
  "version": "1.0.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Joke Extension"
  },
  "icons": {
    "64": "/assets/icons/joke64.png",
    "128": "/assets/icons/joking128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4e72437-3023-4aa8-b8c6-f2c741cd3ee4}"
    }
  }
}