Examine source code of Pui Pui Molcar

{
  "applications": {
    "gecko": {
      "id": "puipuimolcar@wildsky.cc",
      "strict_min_version": "51.0"
    }
  },
  "manifest_version": 2,
  "name": "Pui Pui Molcar",
  "version": "0.5.0",
  "description": "Pui Pui!",
  "icons": {
    "48": "icons/icon48.png"
  },
  "web_accessible_resources": [
    "run.gif"
  ],
  "content_scripts": [
    {
      "match_about_blank": true,
      "all_frames": false,
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "css": [
        "molcar.css"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}