Examine source code of Move Reminder

{
  "manifest_version": 2,
  "name": "Move Reminder",
  "version": "3.1",
  "description": "A gentle chime that nudges you to get up and move — on your schedule, at your volume.",
  "browser_specific_settings": {
    "gecko": {
      "id": "move-reminder@local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "alarms",
    "storage",
    "notifications"
  ],
  "background": {
    "scripts": [
      "chime.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Move Reminder",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  }
}