I'd love to ditch the icons by the toolbar. I rarely/never use them and it really irks me having to see them there all the time.
This includes Refresh, Start Page, VPN, Add to Pinboard, Snapshot, Privacy Protection, Favourites, Extensions, Downloads, and Synchronisation.
That's nine icons cluttering up my browser... With so many customisation options, I find it really strange that you can't change these as well.
One more thing - I really like the Player feature in the sidebar but I don't want to waste screen realestate with the sidebar for only one feature. Why can't we have the option to relocate sidebar icons to the toolbar up the top?