* I have created app tabs and one group tab. * Upon restart of FireFox, my app tabs remained but my group tab disappeared. * I do clear 'Form & Search History', 'Cookies', 'Active Logins' and 'Cache' upon closing but I do not clear 'Browsing History' nor 'Download History'. Is there perhaps some sort of a 'save' step in creating Group Tabs or is this a bug?