Examine source code of martin.party

{
  "manifest_version": 2,
  "name": "martin.party",
  "description": "Die offizielle martin.party Erweiterung",
  "version": "1.0.2resigned1",
  "icons": {
    "128": "favicon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "scripts/embed.js"
      ],
      "css": [
        "style/style.css"
      ],
      "run_at": "document_end"
    }
  ],
  "applications": {
    "gecko": {
      "id": "martin.party@nexttrex"
    }
  },
  "browser_action": {
    "default_popup": "pages/popup.html"
  }
}