Examine source code of DuelingBook Overflow

{
  "name": "DuelingBook Overflow",
  "manifest_version": 3,
  "version": "1.1.4",
  "description": "Unlock Extended Mechanics, Left-Click Action Menu, Effect Text Highlighting and more for DuelingBook.",
  "permissions": [
    "tabs",
    "storage",
    "scripting",
    "webNavigation"
  ],
  "action": {
    "default_title": "Settings",
    "default_icon": "icon.png",
    "default_popup": "onextensionpressed.html"
  },
  "host_permissions": [
    "*://*.duelingbook.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.duelingbook.com/*"
      ],
      "js": [
        "src/content/loader.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "*.js",
        "*.html",
        "*.css",
        "*.txt",
        "src/content/*.js"
      ],
      "matches": [
        "*://*.duelingbook.com/*"
      ]
    }
  ],
  "externally_connectable": {
    "matches": [
      "*://*.duelingbook.com/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "duelingbook-overflow@cdiserio.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}