https download

Trying to web scrape https data.
As you know httpGet$ will not download https data. So trying JavaScript.
I know very little about JS, so need the JS experts to jump in.
I'm trying the download.download script described here: developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/downloads/download

Basically I get nothing back. I added a alert() to the code just to see if it was executing. It shows the alert.

html "<script>
function onStartedDownload(id) {
console.log(`Started downloading: ${id}`);
}

function onFailed(error) {
console.log(`Download failed: ${error}`);
}

var downloadUrl = 'https://finance.yahoo.com/most-active?.tsrc=fin-srch';
alert(downloadUrl);
var downloading = browser.downloads.download({
url : downloadUrl,
saveAs : true;
filename : 'e:/data/temp/hist.txt',
conflictAction : 'uniquify'
});
downloading.then(onStartedDownload, onFailed);

</script>"
wait
---------------------------------------------
To make it very simple, I tried this:
html "<script>

var downloading = browser.downloads.download({
url : 'https://www.google.com/',
filename : 'hist.txt'
});

</script>"
wait

Thanks for the help..
Dan