Examine source code of BM+ by GK

{
  "manifest_version": 2,
  "name": "BM+ by GK",
  "version": "1.0",
  "content_scripts": [
    {
      "matches": [
        "*://www.battlemetrics.com/*",
        "*://battlemetrics.com/*"
      ],
      "js": [
        "query_data.js",
        "rcon_player.js"
      ]
    }
  ],
  "permissions": [
    "*://www.battlemetrics.com/*",
    "*://api.battlemetrics.com/*",
    "*://battlemetrics.com/*"
  ],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  }
}