Re: [w3c/ServiceWorker] New "setup" lifecycle for service worker (#1576)

Yes, if it needs changing:

```js
let dataPromise;

function updateDataPromise() {
  dataPromise = new Promise((resolve, reject) => {
    chrome.storage.sync.get(null, (data) => resolve(data));
  });
}

updateDataPromise();

// listen browser events, for example:
chrome.tabs.onUpdated.addListener(async (parameters) => {
  const data = await dataPromise;
});
```

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