Examine source code of Sindup

{
  "manifest_version": 3,
  "name": "Sindup",
  "author": "Sindup",
  "version": "2.0.1",
  "description": "__MSG_application_description__",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "notifications"
  ],
  "background": {
    "scripts": [
      "scripts/service_worker.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options.html"
  },
  "action": {
    "default_icon": "icons/icon48.png",
    "default_title": "__MSG_button_label__"
  },
  "content_security_policy": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@sindup.net"
    }
  }
}