Examine source code of KSF Profiler

{
  "manifest_version": 2,
  "name": "KSF Profiler",
  "version": "1.0.1",
  "description": "Adds a Steam profile link near player names on ksf.surf player pages.",
  "content_scripts": [
    {
      "matches": [
        "https://ksf.surf/players/STEAM_*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "STEAM.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ksf-profiler@x0reaxe.ax",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "109.0"
    }
  }
}