Examine source code of Simple YouTube

{
  "description": "Simple YouTube is a lightweight extension that simplifies your YouTube experience by removing unnecessary clutter.",
  "version": "2.3.2",
  "manifest_version": 2,
  "name": "Simple YouTube",
  "permissions": [
    "storage",
    "*://*.youtube.com/*"
  ],
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png"
  },
  "browser_action": {
    "default_popup": "src/popup/index.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "src/contentScript/index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "roman@lerchster.dev"
    }
  }
}