Created attachment 735885 [details] Screenshort of overlap When runnning with Personas on Mac, the tab bar goes up and over the title bar. If you run with the default theme, then everything is as expected with the tab bar underneath the title bar.
Created attachment 736154 [details] [diff] [review] proposed fix This is because we don't use the titlebar vbox under OS X. I'm still waiting for the finished Firefox draw in titlebar implementation to port it to TB. This patch is a workaround until we can port the end solution. FX also used sometime this approach. So it's not really a hack.
Comment on attachment 736154 [details] [diff] [review] proposed fix Yep, totally. Thanks Richard!
Comment on attachment 736154 [details] [diff] [review] proposed fix This is a super-safe take for comm-aurora.