Examine source code of Character.AI Old-ifier

{
  "manifest_version": 2,
  "name": "Character.AI Old-ifier",
  "version": "1.2",
  "description": "Tired of seeing the new character.ai design? This extension makes the new site look like the old character.ai. Old character.ai has since shutdown, new updates to this extension will not be happening in the nearby future, for now.",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.character.ai/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "old-character-extension.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{930d6f3d-c09b-4d32-a849-610a4b4e1710}"
    }
  }
}