Examine source code of Futbin Charts

{
  "name": "Futbin Charts",
  "description": "Display price charts directly in Futbin players list view",
  "version": "0.5.0",
  "manifest_version": 2,
  "icons": {
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "https://www.futbin.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.futbin.com/players*",
        "https://www.futbin.com/19/players*",
        "https://www.futbin.com/20/players*",
        "https://www.futbin.com/21/players*",
        "https://www.futbin.com/22/players*"
      ],
      "js": [
        "content/players.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://www.futbin.com/19/pgp*",
        "https://www.futbin.com/20/pgp*",
        "https://www.futbin.com/21/pgp*",
        "https://www.futbin.com/22/pgp*"
      ],
      "js": [
        "content/pgp.js"
      ],
      "run_at": "document_end"
    }
  ]
}