Examine source code of Comic Overlay (Demo)

{
  "name": "Comic Overlay (Demo)",
  "version": "0.4",
  "description": "Applies translation overlays to the raw comic.",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://*.kuragebunch.com/*"
      ],
      "js": [
        "comic_border_style.js"
      ],
      "run_at": "document_idle"
    }
  ]
}