Examine source code of CSGORep Badge

{
  "manifest_version": 2,
  "name": "CSGORep Badge",
  "version": "1.0.0",
  "description": "Shows CSGORep reputation badge on Steam profile pages",
  "browser_specific_settings": {
    "gecko": {
      "id": "{7c1b2a4e-9f6d-4a55-8c91-3b1e2f9d4c62}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "https://api.csgo-rep.com/*",
    "https://steamcommunity.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://steamcommunity.com/id/*",
        "https://steamcommunity.com/profiles/*"
      ],
      "js": [
        "content/steam-profile.js"
      ],
      "css": [
        "styles/badge.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "icons/logo.png"
  ]
}