Examine source code of nd-btns

{
  "name": "nd-btns",
  "description": "nd-btns",
  "version": "0.1.3",
  "manifest_version": 3,
  "author": "Théo",
  "options_ui": {
    "page": "options.html",
    "browser_style": false
  },
  "icons": {
    "128": "/icons/brainly.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "options.html"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "*://*.nosdevoirs.fr/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://nosdevoirs.fr/*"
      ],
      "js": [
        "script.js"
      ],
      "css": [
        "css.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "nd-btns@theo.drf"
    }
  }
}