Share your experience!
On my sony z3 after I click google and go to my outlook email I can't then open a 2nd window without the outlook window closing, or at least not be visable when i look for by tapping the square icon on the screen's bottom right. I thought I used to be able to do this by tapping the 3 vertical dots on the upper right and a New Tab appears. But when I tap on it the Outlook window closes.
Bingo! Found a solution: There's a tiny square box in the upper right corner between the web address bar and those 3 vertical dots. It shows the number of windows you have open.