await page.click('[service_name="facebook"]')
const newPagePromise = new Promise(x => browser.once('targetcreated', target => x(target.page())));
const popup = await newPagePromise;
await popup.waitForSelector('[name="__CONFIRM__"]')
const confirm = await popup.$('[name="__CONFIRM__"]')
await popup.click('[name="__CONFIRM__"]')
await page.waitFor(2000);
await page.goto('your login page');