Examine source code of QuantumPHP

{
  "manifest_version": 2,
  "name": "QuantumPHP",
  "version": "1.1.13",
  "description": "This extension adds logs sent by your server to the developer tools console in the browser, with a nice table format. It is like adding console.log functionality to your server side scripts. This is better than displaying debug data right in the body of your web page or API/AJAX responses. The QuantumPHP extension can take debug data from your HTML, Cookies, and/or X-ChromeLogger-Data header. This extension does not use or send your data anywhere else. This extension normally works with the QuantumPHP package (see QuantumPHP.php) but those server logs can technically be sent by any server application or language. To get updates and bug fixes, please find this extension (QuantumPHP) in Firefox, then click manage or click the setting icon, then click Check for Updates.",
  "homepage_url": "https://github.com/frankforte/quantumphp",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "cookies"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bafb438c-c684-4ef9-b8d8-33051f6f29ee}"
    }
  }
}