Examine source code of ClassInTheBox

{
  "name": "ClassInTheBox",
  "description": "Sistema profesional de video conferencia: simple, rápido, con cancelación de ruido avanzada y portable",
  "version": "1.0.12",
  "manifest_version": 2,
  "minimum_chrome_version": "88.0",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "CITB COLOR SIN CIRCULO.png",
      "48": "CITB COLOR SIN CIRCULO.png",
      "64": "CITB COLOR SIN CIRCULO.png",
      "128": "CITB COLOR SIN CIRCULO.png"
    }
  },
  "icons": {
    "16": "CITB COLOR SIN CIRCULO.png",
    "48": "CITB COLOR SIN CIRCULO.png",
    "128": "CITB COLOR SIN CIRCULO.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://meet.google.com/*",
        "https://zoom.us/*",
        "https://*.zoom.us/*",
        "https://meet.jit.si/*",
        "https://teams.live.com/*",
        "https://teams.microsoft.com/*"
      ],
      "js": [
        "js/inject.js",
        "js/external/material.min.js"
      ],
      "css": [
        "css/floatinbuttons.css",
        "css/material.min.css"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "web_accessible_resources": [
    "js/*",
    "helper/*",
    "css/font/*",
    "html/*"
  ],
  "externally_connectable": {
    "ids": [
      "pgloinlccpmhpgbnccfecikdjgdhneof"
    ],
    "matches": [
      "https://meet.google.com/*",
      "https://zoom.us/*",
      "https://*.zoom.us/*",
      "https://meet.jit.si/*",
      "https://teams.live.com/*",
      "https://teams.microsoft.com/*"
    ]
  }
}