This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
The longer answer is that using the target attribute of a form (whose action you can fill in from the URL returned from the Ajax request) can be set to open the response in a new window. Whether that creates a new browser window or creates a new tab is not under your control., but is a browser setting specified by the user (which you, thankfully, cannot override).
Joined: Jul 22, 2010
but it is not working in mozilla. Is that any other way to open a page in new tab