Examine source code of Skip Silence

{
  "manifest_version": 2,
  "name": "Skip Silence",
  "description": "Skip silent parts in videos and podcasts automatically.",
  "version": "6.0.2",
  "icons": {
    "16": "icon/16.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "commands": {
    "toggle-enabled": {
      "suggested_key": {
        "default": "Ctrl+Shift+S"
      },
      "description": "Enable or disable Skip Silence"
    }
  },
  "web_accessible_resources": [
    "volume-processor.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{89595993-7775-4bd4-af57-44e57302d5ce}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Skip Silence",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}