Examine source code of Skip Silence

{
  "icons": {
    "16": "icon16.393cdc9f.png",
    "48": "icon48.1c300d39.png",
    "128": "icon128.e752ac4b.png"
  },
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icon16.393cdc9f.png",
      "48": "icon48.1c300d39.png"
    },
    "default_popup": "popup.dd98efd0.html"
  },
  "version": "5.0.8",
  "name": "Skip silence",
  "description": "Skip silent parts in videos and audio files.",
  "author": "vantezzen",
  "background": {
    "scripts": [
      "background.c998ece8.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabCapture",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contents.04d427ca.js"
      ],
      "all_frames": true,
      "css": []
    }
  ],
  "commands": {
    "toggle-enable": {
      "suggested_key": {
        "default": "Ctrl+Shift+S"
      },
      "description": "Enable/disable Skip Silence for the current tab"
    },
    "toggle-command-bar": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "Show/hide the command bar"
    }
  },
  "default_locale": "en",
  "web_accessible_resources": [
    "contents.329742ff.css",
    "poppins-devanagari-400-normal.a8c9bb71.woff2",
    "poppins-all-400-normal.b37b05a6.woff",
    "poppins-latin-ext-400-normal.66fdffca.woff2",
    "poppins-latin-400-normal.f164f657.woff2",
    "poppins-devanagari-600-normal.28c87a0d.woff2",
    "poppins-all-600-normal.869a0f05.woff",
    "poppins-latin-ext-600-normal.97640522.woff2",
    "poppins-latin-600-normal.615c5c47.woff2",
    "contents.bbf50309.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{89595993-7775-4bd4-af57-44e57302d5ce}"
    }
  }
}