Examine source code of The Nag

{
  "manifest_version": 3,
  "name": "The Nag",
  "version": "1.0.0",
  "description": "Stop multitasking. One task at a time with timed sub-steps and post-task reflection.",
  "browser_specific_settings": {
    "gecko": {
      "id": "the-nag@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "permissions": [
    "storage",
    "alarms",
    "notifications",
    "tabs"
  ],
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}