Examine source code of Andy666 FuteMax

{
  "manifest_version": 2,
  "name": "Andy666 FuteMax",
  "author": "Andy666 - George Anderson Lima Costa",
  "developer": {
    "name": "Andy666 - George Anderson Lima Costa",
    "url": "https://www.linkedin.com/in/george-anderson-lima-costa/"
  },
  "version": "1.8",
  "description": "Basicamente consiste em uma serie de Javascript usados para desativar popups e anuncios do site, facilitando a navegacao.",
  "applications": {
    "gecko": {
      "id": "FuteMax@Andy666"
    }
  },
  "browser_action": {
    "default_title": "Andy666 FuteMax",
    "default_icon": {
      "16": "icons/border-16.png",
      "19": "icons/border-19.png",
      "24": "icons/border-24.png",
      "32": "icons/border-32.png",
      "38": "icons/border-38.png",
      "48": "icons/border-48.png",
      "64": "icons/border-64.png",
      "96": "icons/border-96.png",
      "128": "icons/border-128.png",
      "192": "icons/border-192.png"
    }
  },
  "icons": {
    "16": "icons/border-16.png",
    "19": "icons/border-19.png",
    "24": "icons/border-24.png",
    "32": "icons/border-32.png",
    "38": "icons/border-38.png",
    "48": "icons/border-48.png",
    "64": "icons/border-64.png",
    "96": "icons/border-96.png",
    "128": "icons/border-128.png",
    "192": "icons/border-192.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://developer.mozilla.org/*",
        "*://*.futemax.fm/*",
        "*://futemax.fm/*"
      ],
      "js": [
        "jquery-3.5.1.min.js",
        "main.js"
      ]
    }
  ]
}