Examine source code of YouTube Booster

{
  "manifest_version": 2,
  "name": "YouTube Booster",
  "description": "Video speed, audio normalization, OSINT, auto pause, looped #shorts, video markers, keywords, and more...",
  "version": "0.5.4",
  "author": "dweorh's solutions",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    },
    "default_popup": "popup.html",
    "default_title": "YouTube Booster"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "all_frames": true,
      "js": [
        "contentScript.js"
      ],
      "css": [
        "contentScript.css",
        "app/styles/common.css"
      ]
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "tabs",
    "declarativeContent",
    "storage",
    "*://*.youtube.com/*"
  ],
  "web_accessible_resources": [
    "app/js/pageScripts.js",
    "images/icons/add.png",
    "images/icons/delete.png",
    "images/icons/save.png",
    "images/icons/cancel.png",
    "images/icons/stop.png",
    "images/icons/play.png",
    "images/icons/pause.png",
    "images/icons/clipboard.png",
    "images/icons/reload.png",
    "images/icons/chapter2marker.png",
    "images/icons/edit.png",
    "images/icons/flip-v.png",
    "images/icons/flip-h.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f0410d0b-d29d-42bf-b86c-fab69b74a07c}"
    }
  }
}