Examine source code of Dark UI for Figma

{
  "name": "Dark UI",
  "version": "1.2.1",
  "description": "Dark UI extension for Figma Webapp",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://www.figma.com/*"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "icons": {
    "16": "DarkUIFigmaLogo16.png",
    "48": "DarkUIFigmaLogo48.png",
    "128": "DarkUIFigmaLogo128.png"
  }
}