Examine source code of Boring YouTube

{
  "manifest_version": 2,
  "name": "Boring YouTube",
  "version": "2.0.0",
  "description": "A lightweight browser extension that turns YouTube thumbnails grayscale — inspired by Arc's Boring YouTube Boost.",
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{c75c1b77-f5a8-4c67-95a0-29cb86a9d39f}"
    }
  },
  "permissions": [
    "*://www.youtube.com/*",
    "*://youtube.com/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Toggle Boring YouTube",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://youtube.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "author": "Delacrix Morgan",
  "homepage_url": "https://github.com/delacrixmorgan/BoringYouTube"
}