Examine source code of Which Font?

{
  "manifest_version": 3,
  "name": "Which Font?",
  "description": "Hover over any text to instantly see its font family, size, weight, color, and HTML tag.",
  "version": "1.3.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "whichfont@omarfaruk.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "scripting",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "assets/icons/icon16.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png"
  },
  "action": {
    "default_title": "Which Fonts?",
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "48": "assets/icons/icon48.png",
      "128": "assets/icons/icon128.png"
    }
  }
}