Examine source code of TodoMark

{
  "manifest_version": 3,
  "name": "TodoMark",
  "version": "1.1",
  "description": "A simple to-do list extension for saving and managing URLs with sync support across devices",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1d54d674-44cc-4bc6-bb61-c561da55b6cf}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_icon": "icons/icon128.png",
    "default_title": "TodoMark",
    "default_popup": "todomark.html"
  }
}