I found that in recent version of Firefox, there was add a setting called "Open new windows in a new tab instead".
When I keep it on, all the pop windows(Using javascript "window.open" function opened) opened in a new tab, which I realy need opened in a pop window(With settings like "menubar=no" and etc.). Some normal links with "target="_blank" attribute will open in new window if I keep it off.
So, is anyone here knows whether it's a bug or maybe I mistake someting?
Thanks.