Examine source code of Merge PDF - PDF Stacker

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "version": "1.0.0",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "assets/images/icon16.png",
      "38": "assets/images/icon38.png",
      "48": "assets/images/icon48.png",
      "128": "assets/images/icon128.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "assets/images/icon16.png",
    "38": "assets/images/icon38.png",
    "48": "assets/images/icon48.png",
    "128": "assets/images/icon128.png"
  },
  "options_page": "options.html",
  "permissions": [
    "storage",
    "downloads"
  ],
  "host_permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "pdf-stacker@newapptome.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}