Examine source code of Flip the Web

{
  "manifest_version": 2,
  "name": "Flip the Web",
  "version": "1.1",
  "description": "Give your browsing experience a whole new perspective! This extension rotates all websites by 180 degrees, providing a fun, upside-down look at the internet. Firefox settings remain unchanged, and the world returns to normal when you deactivate the plugin. Perfect for a quirky change or a harmless prank",
  "icons": {
    "32": "icons/upside-32.png",
    "48": "icons/upside-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "upsidedown.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{26b94cc0-2361-4646-b889-f0b09e8fad1a}"
    }
  }
}