Examine source code of Dynamic URL Collector

{
  "manifest_version": 2,
  "name": "URL Collector",
  "version": "1.2.1",
  "description": "Records URLs while you scroll.",
  "icons": {
    "48": "icons/icon-inactive-48.png",
    "96": "icons/icon-inactive-96.png"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_icon": "icons/icon-inactive-48.png",
    "default_title": "Start URL Recording"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{600d7250-c302-420e-96d4-f82c969a0d21}"
    }
  }
}