Examine source code of 99lookup

{
  "manifest_version": 2,
  "name": "99lookup",
  "version": "1.0.4",
  "description": "Matchvote lookup for 99damage.",
  "icons": {
    "48": "icons/table.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://liga.99damage.de/leagues/teams/*"
      ],
      "js": [
        "99lookup.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "permissions": [
    "*://*.99damage.de/*"
  ]
}