Examine source code of Better Shorts Player

{
  "manifest_version": 2,
  "name": "Better Shorts Player",
  "version": "1.0.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "joubertvanzyl10@gmail.com",
      "strict_min_version": "54.0"
    }
  },
  "web_accessible_resources": [
    "assets/pause.png",
    "assets/play.png",
    "assets/muted.png",
    "assets/unmuted.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "script.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "tabs"
  ],
  "icons": {
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  }
}