Examine source code of Simple Tab Manager

{
  "manifest_version": 3,
  "name": "Simple Tab Manager",
  "version": "2.0.0",
  "description": "Bring tabs together, remove duplicate URLs, and sort them by domain.",
  "permissions": [
    "tabs",
    "tabGroups",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_title": "Simple Tab Manager",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a69d42cb-0283-4e28-9a86-47e4274dc993}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}