Is there a way to close a tab in WebDriver or Protractor?

You can try the following:

1. Switch to the new opened tab.
2. Close the current windows (in this case, the new tab).

3. Switch back to the first window.

   browser.getAllWindowHandles().then(function (handles) {
   browser.driver.switchTo().window(handles[1]);
   browser.driver.close();
   browser.driver.switchTo().window(handles[0]);
   });