UWL URLLauncher open window only in tabs

Hi,

I have used a URL Launcher in UWL ItemType configuration and it work well. But there are different ways of opening Windows.

The excpected way: The user clicks on a Task and the Launcher opens a new Window as a new tab. NO popup.

In IE it works well, but in Firefox, the launcher opens a new popup window.

I there a way to prevent this, so every new window is a tab?

Configuration part is in the attachments.