 web​Request​.onBefore​Request.addListener takes multiple params

Hi
[Regarding to documentation](https://developer.mozilla.org/ru/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/onBeforeRequest) ` web​Request​.onBefore​Request.addListener` takes multiple parameters.
How can i configure [BlockingResponse](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/BlockingResponse) ?
used extension version 0.4