When I open a new window (private or not) from taskbar right-click menu on firefox icon it opens but the window is inactive (when I try to write text or press a hotkey it just doesn't work until I click on the newly opened window and do it again). For me it looks like the active window is "taskbar" but I'm pretty sure it's a problem with firefox because I've never seen this happening to other apps. Maybe there is a hidden option or something that I have to enable?