Examine source code of Quizplus

{
  "manifest_version": 3,
  "name": "Quizplus",
  "version": "1.0.40",
  "description": "BrowserExtension has been curated for ease of access to the limitless library of premium supplementary materials",
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*",
        "*://*.quizplus.com/*",
        "https://local.quizplusdev.com:4200/*"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "./content-scripts/mark.js",
        "./content-scripts/prism.min.js",
        "./content-scripts/index.js"
      ],
      "css": [
        "./content-scripts/index.css",
        "./content-scripts/prism.okaidia.min.css"
      ]
    }
  ],
  "action": {
    "default_popup": "./default-popup/index.html"
  },
  "background": {
    "scripts": [
      "./context-menu/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "chrome-extension@quizplus.com"
    }
  },
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "host_permissions": [
    "*://quizplus.com/*"
  ],
  "icons": {
    "16": "./assets/icon-16.png",
    "32": "./assets/icon-48.png",
    "128": "./assets/icon-128.png"
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'"
  }
}