gecko-dev/browser/extensions/webcompat/experiment-apis/experiments.json

[
  {
    "namespace": "experiments",
    "description": "experimental API extension to allow checking the status of Fennec experiments via Switchboard",
    "functions": [
      {
        "name": "isActive",
        "type": "function",
        "description": "Determine if a given experiment is active.",
        "parameters": [
          {
            "name": "name",
            "type": "string",
            "description": "The experiment's name"
          }
        ],
        "async": true
      }
    ]
  }
]