Examine source code of TabNews Save

{
  "name": "TabNews Save",
  "description": "Salve os posts do TabNews para ler mais tarde.",
  "version": "1.0.1",
  "manifest_version": 3,
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "storage"
  ],
  "action": {
    "default_popup": "index.html"
  },
  "icons": {
    "16": "assets/icons/icon16.png",
    "32": "assets/icons/icon32.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabnews-save@silvanomarques.com"
    }
  }
}