Examine source code of Summary Box for Wikipedia

{
  "manifest_version": 3,
  "name": "Summary Box for Wikipedia",
  "version": "2.2.1",
  "description": "Select or double-click any term on any website and its Wikipedia summary appears next to it. If nothing clear is found, search Wikipedia right inside the box. Star articles to find them again later. No tracking, open source, no accounts.",
  "author": "Dominik Fehr",
  "homepage_url": "https://su-pa.net/wikiPrevBox/",
  "icons": {
    "48": "icons/wiki-summary-w-on.svg",
    "96": "icons/wiki-summary-w-on.svg",
    "128": "icons/wiki-summary-w-on.svg"
  },
  "action": {
    "default_icon": "icons/wikibox.svg",
    "default_title": "Summary Box for Wikipedia",
    "default_area": "navbar"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "commands": {
    "toggle-extension": {
      "suggested_key": {
        "default": "Alt+Shift+W"
      },
      "description": "Turn the summary box on or off"
    },
    "toggle-site": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "Turn the summary box on or off for the current site"
    }
  },
  "background": {
    "scripts": [
      "settings.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "settings.js",
        "wikipediaPreviewEnhanced.js"
      ],
      "css": [
        "wikiBoxHost.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "permissions": [
    "storage",
    "menus"
  ],
  "host_permissions": [
    "*://*.wikipedia.org/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "wikiPreviewBox.css",
        "SegoeWP-Semilight.woff2",
        "wiki-W.woff2",
        "bullet.gif"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "wikibox@su-pa.net",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}