Examine source code of Add to Rocket-List

{
  "manifest_version": 3,
  "name": "__MSG_extension_name__",
  "version": "1.2.1",
  "description": "__MSG_extension_description__",
  "default_locale": "en",
  "permissions": [
    "scripting",
    "activeTab",
    "storage"
  ],
  "icons": {
    "16": "images/rocketlist-favicon-16x16.png",
    "32": "images/rocketlist-favicon-32x32.png",
    "48": "images/rocketlist-favicon-48x48.png",
    "96": "images/rocketlist-favicon-96x96.png",
    "128": "images/rocketlist-favicon-128x128.png"
  },
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "action": {
    "default_title": "__MSG_add_to_rocketlist__",
    "default_icon": {
      "16": "images/rocketlist-favicon-16x16.png",
      "32": "images/rocketlist-favicon-32x32.png",
      "48": "images/rocketlist-favicon-48x48.png",
      "96": "images/rocketlist-favicon-96x96.png",
      "128": "images/rocketlist-favicon-128x128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@rocket-list.com"
    }
  }
}