Examine source code of GD Song Verifier

{
  "manifest_version": 3,
  "name": "GD Song Verifier",
  "description": "Checks if the Newgrounds ID of the song can be used for Geometry Dash or not.",
  "version": "1.0.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "lucamuino@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "48": "includes/images/icon48.png",
    "128": "includes/images/icon128.png"
  },
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "48": "includes/images/icon48.png",
      "128": "includes/images/icon128.png"
    }
  },
  "host_permissions": [
    "https://*.newgrounds.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "scripting"
  ]
}