Examine source code of Order Book Visualizer

{
  "manifest_version": 2,
  "name": "Order Book Visualizer",
  "version": "1.0",
  "description": "Visualizes order book available at gragieldowa.pl",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "Order Book Visualizer"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://*.gragieldowa.pl/spolka_arkusz_zl/spolka/*",
        "https://gragieldowa.pl/spolka_arkusz_zl",
        "file:///home/bartek/Desktop/Arkusz%20zlece%C5%84%20sp%C3%B3%C5%82ki%20KGHM%20Symulator%20gie%C5%82dy%20-%20Wirtualna%20Gra%20Gie%C5%82dowa.html"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "chart.js",
        "visualizer.js"
      ]
    }
  ]
}