Examine source code of TinyURL Tools

{
  "manifest_version": 2,
  "name": "TinyURL Tool",
  "version": "1.0",
  "description": "Generate a short TinyURL for easier sharing.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "permissions": [
    "tabs",
    "clipboardWrite",
    "https://tinyurl.com/*"
  ],
  "browser_action": {
    "default_title": "TinyURL Tool",
    "default_icon": "icon64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{06f7c75d-f898-4221-b63a-b447d848b00a}",
      "strict_min_version": "100.0"
    }
  }
}