How can I handle download pop up from safari

[prafful24]

I am trying to download a file before starting my test, but it gets stuck at the allow/deny pop up for safari and I am unable to close it or allow the download in the background (which i am able to do for other browsers
For firefox I used, and it seems to do the job.
"firefox": { "desiredCapabilities": { "browserName": "Firefox", 'moz:firefoxOptions': { prefs: { 'browser.helperApps.neverAsk.saveToDisk': 'image/jpeg;application/binary;application/pdf;text/plain;application/text;text/xml;application/xml;text/html;text/csv;video/mp4' }, } } }