Examine source code of Trademart Extinction

{
  "content_scripts": [
    {
      "css": [
        "css/Style.css"
      ],
      "js": [
        "index.js"
      ],
      "matches": [
        "*://steamcommunity.com/id/*",
        "*://steamcommunity.com/profiles/*"
      ]
    }
  ],
  "description": "This extention is to see if a user is banned in trademart, or steam-rep etc.",
  "icons": {
    "64": "icons/icon.png"
  },
  "manifest_version": 2,
  "name": "Trademart Extinction",
  "permissions": [
    "activeTab",
    "*://steamcommunity.com/id/*",
    "*://steamcommunity.com/profiles/*",
    "*://vu.je/*"
  ],
  "version": "0.4",
  "web_accessible_resources": [
    "icons/*.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ec453b4-a171-4902-8685-141338367b33}"
    }
  }
}