Examine source code of VocabReminder

{
  "manifest_version": 3,
  "name": "VocabReminder",
  "version": "1.3.3",
  "description": "Connect what you see to what you learn.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup/index.html"
  },
  "permissions": [
    "scripting",
    "activeTab",
    "contextMenus",
    "storage",
    "tabs",
    "alarms",
    "cookies"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "assets/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "assets/content-css.css"
      ],
      "js": [
        "assets/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "assets/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "nguyenvinhquang04012001@gmail.com",
      "strict_min_version": "128.0"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  }
}