Custom Youtube Playback Speed

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Custom Youtube Playback Speed",
  "description": "Easy way to change youtube video playback speed",
  "version": "1.4.3",
  "short_name": "YTSpeed",
  "author": "Krzaku",
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "index.html",
    "default_title": "Custom yt playback speed settings"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "index.js"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ]
    }
  ],
  "icons": {
    "16": "/icons/extension_icon16.png",
    "32": "/icons/extension_icon32.png",
    "48": "/icons/extension_icon48.png",
    "128": "/icons/extension_icon128.png"
  }
}