Examine source code of Wikipedia Sticky Headers

{
  "manifest_version": 3,
  "name": "Wikipedia Sticky Headers",
  "description": "Make table headers sticky on Wikipedia.",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{3144CC4C-25AB-43B6-BD03-F874A71E13B9}",
      "strict_min_version": "109.0"
    }
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'"
  },
  "action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "images/icon-16.png",
      "32": "images/icon-32.png"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "content_scripts": [
    {
      "run_at": "document_idle",
      "js": [
        "scripts/main.js"
      ],
      "matches": [
        "https://developer.chrome.com/docs/extensions/*",
        "https://developer.chrome.com/docs/webstore/*",
        "*://*.mozilla.org/*",
        "*://*.wikipedia.org/*"
      ]
    }
  ]
}