Examine source code of Tabs Volume Control

{
  "manifest_version": 2,
  "name": "Tab Volume Control",
  "version": "1.0.1",
  "description": "Control audio volume for individual browser tabs",
  "author": "Joker",
  "homepage_url": "https://github.com/yourusername/tab-volume-control",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Control Tab Volume",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{de34435e-90c0-48e6-a3ca-b77d8518b5c4}"
    }
  }
}