Just installed Win10 1511, and finally, the active window's title bar gets colored again (if you turn it on, which I immediately did). Thunderbird 38 colors the area behind its tabs, and the background of inactive tabs, leaving the active tab with a white background. Firefox 42 somehow resulted in an actual title bar appearing again (yes, tweaking browser.tabs.drawInTitlebar toggles it), and the title bar is the right color when active, white when not, but the tabs are underneath. I like the behavior in Thunderbird 38. How do I get it in Firefox?