Examine source code of ChatGPT simple Widescreen

{
  "manifest_version": 3,
  "name": "ChatGPT Widescreen",
  "version": "1.2.1",
  "description": "A minimal Firefox extension that widens the ChatGPT chat layout on chatgpt.com using CSS only.",
  "author": "Arne, with support from ChatGPT",
  "homepage_url": "https://chatgpt.com/",
  "browser_specific_settings": {
    "gecko": {
      "id": "chatgpt-widescreen@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://chatgpt.com/*"
      ],
      "css": [
        "widescreen.css"
      ],
      "run_at": "document_start"
    }
  ]
}