Examine source code of Proxy Quick Toggle

{
  "manifest_version": 2,
  "name": "Proxy Quick Toggle",
  "version": "1.0.0",
  "description": "One-click switching between No Proxy (direct connection) and System Proxy Settings.",
  "browser_specific_settings": {
    "gecko": {
      "id": "proxy-quick-toggle@local",
      "strict_min_version": "91.1.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "proxy",
    "storage",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Proxy Quick Toggle",
    "default_icon": {
      "16": "icons/icon-direct.svg",
      "32": "icons/icon-direct.svg",
      "48": "icons/icon-direct.svg"
    }
  },
  "icons": {
    "48": "icons/icon-direct.svg",
    "96": "icons/icon-direct.svg"
  },
  "commands": {
    "toggle-proxy": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      },
      "description": "Toggle between No Proxy and System Proxy"
    }
  }
}