Examine source code of Safe Stand Break Reminder

{
  "manifest_version": 2,
  "name": "Safe Stand Break Reminder",
  "version": "1.3.1",
  "description": "A privacy-friendly stand/break reminder using Firefox idle detection only.",
  "developer": {
    "name": "Parviz Asoodehfard"
  },
  "permissions": [
    "idle",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Stand Break Reminder",
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icon.svg"
    }
  },
  "icons": {
    "32": "icon.svg",
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "safe-stand-break-reminder@parviz.asoodehfard",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}