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Async/await functionality does not function as expected within LWC components when using Firefox.

We tried to use it in our LWC async/await but it is not working only on Firefox. Here is a simple example. On the Firefox this alert doesn’t show.

async init() {
    let promise = new Promise((resolve, reject) => {
        setTimeout(() => resolve("done!"), 1000)
      let result = await promise; // wait until the promise resolves (*)
      alert(result); // "done!"

  connectedCallback() {