Examine source code of Youtube Thumbnail Size Grid Controller

{
  "manifest_version": 3,
  "name": "Youtube Thumbnail Size Grid Controller",
  "version": "3.9",
  "description": "Fix YouTube's layout: Display 1-16 videos per row. Reduce scrolling, hide Shorts, and customize the sidebar.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "Grid Settings"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "resources": [
        "ytZara.js",
        "inject_script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1e54aef3-0fd4-4387-b11d-b5d0a08e6236}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}