Examine source code of Esfera colors FP

{
  "manifest_version": 3,
  "name": "Esfera colors FP",
  "version": "4.2",
  "description": "Millora visual per a l’avaluació d’FP a Esfer@: ressaltat intel·ligent i càrrega de dades.",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "windows",
    "scripting"
  ],
  "host_permissions": [
    "https://bfgh.aplicacions.ensenyament.gencat.cat/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://bfgh.aplicacions.ensenyament.gencat.cat/bfgh/avaluacio/*"
      ],
      "js": [
        "calcul.js",
        "inject1.js",
        "inject2.js",
        "inject3.js",
        "template.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "page_context_script.js",
        "icon128.png"
      ],
      "matches": [
        "https://bfgh.aplicacions.ensenyament.gencat.cat/*"
      ]
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "daniel.casals@lacetania.cat"
    }
  }
}