Cookies dialog loads slowly
The new cookies dialog is slow to load. Whereas the old dialog loaded instantaneously, there is now a noticeable delay between clicking on the Manage Cookie button and the time when the dialog appears. I'm afraid this might be the general performance issue with GtkListBox. Since the number of GtkListBoxRows that we might need is unlimited, I fear we'll need to incrementally load the rows as we do for the history dialog.