Examine source code of Old Reddit Toggle

{
  "manifest_version": 3,
  "name": "Old Reddit Toggle",
  "version": "0.1.0",
  "description": "Toggle between old.reddit.com and www.reddit.com with a single click.",
  "browser_specific_settings": {
    "gecko": {
      "id": "old-reddit-toggle@jiacan.h01",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Toggle Reddit version",
    "default_icon": {
      "16": "icons/grey/icon-16.png",
      "32": "icons/grey/icon-32.png",
      "48": "icons/grey/icon-48.png",
      "96": "icons/grey/icon-96.png",
      "128": "icons/grey/icon-128.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+R"
      },
      "description": "Toggle between old and new Reddit"
    }
  },
  "icons": {
    "16": "icons/grey/icon-16.png",
    "32": "icons/grey/icon-32.png",
    "48": "icons/grey/icon-48.png",
    "96": "icons/grey/icon-96.png",
    "128": "icons/grey/icon-128.png"
  }
}