Examine source code of YouTube Skip Silence

{
  "manifest_version": 2,
  "name": "YouTube Silence Skipper",
  "version": "1.0",
  "description": "Automatically skips silent periods in YouTube videos for a smoother viewing experience.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "activeTab",
    "storage",
    "https://www.youtube.com/*"
  ],
  "browser_action": {
    "default_title": "YouTube Silence Skipper",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "shared-constants.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "shared-constants.js",
        "content.js"
      ],
      "css": [
        "toast.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-silence-skipper@example.com"
    }
  }
}