Now that we can click on the right hand date to get to end of thread, another problem. That, as a RMB click in Ffox, always brings up that dialog (which Snipping Tool won't allow me to capture) which has forward and back arrows, refresh circular arrow, and favourties star in its top row. It takes several tries to get the desired dialog which has 'open in new tab'. Everywhere else, with RMB the desired dialog comes up reliably; the behaviour described only happens when RMB clicking on that right hand date.