Examine source code of Reddit Version Switcher

{
  "manifest_version": 2,
  "name": "Reddit Switcher",
  "version": "1.1",
  "description": "Toggle between old.reddit.com and new.reddit.com with one click.",
  "browser_specific_settings": {
    "gecko": {
      "id": "what@jesse.pizza",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon-48.svg",
    "default_title": "Toggle Old/New Reddit",
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+R"
      },
      "description": "Toggle between old and new Reddit"
    }
  }
}