Is a great idea, but is possible add a option for change to:
+Convert all favorite to Icons selection (not only one to one)
+Pass from the icon for read the name of link (easy for find in this mode)
+Color scheme when visit a page (example, microsoft tab change to blue, youtube change to red)
+More icons for secured site (a green color), not secured (red color), malicious scripts (yellow color)
+And smart adblocking for sites with dangerous scripts
These are interesting suggestions. I can see the utility in them. I think in the case of pages with malicious scripts or that are suspected of them, there is already a red motif in place.
Are you seeing any changes yourself?