[Vuejs]-Vue not running in FireFox

i found.

const SpeechRecognition =
    window.SpeechRecognition || window.webkitSpeechRecognition;
  const recognition = new SpeechRecognition();
  recognition.lang = "pt-BR";
  recognition.interimResults = false;
  recognition.maxAlternatives = 1;

This code don’t works in firefox