Examine source code of tromfCardTracker

{
  "manifest_version": 2,
  "name": "tromfCardTracker",
  "version": "0.10.2",
  "description": "card tracker for tromf.ro",
  "icons": {
    "48": "icons/border-48.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.tromf.ro/cruce/?*"
      ],
      "js": [
        "createUI.js",
        "newGame.js",
        "myTurn.js",
        "afk.js",
        "getPlayerName.js",
        "cards.js",
        "main.js"
      ],
      "css": [
        "style.css",
        "reset.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "zeusdata.dev@gmail.com"
    }
  }
}