Click and edit the title, but when you to press tab to reach the confirm button you loose all your changes.
Editing multiple titles is very cumbersome and requires you to switch a lot between mouse and keyboard. Miss the confirm button and you'll have to start over again.
Bonus fix: The toggle bookmarks menu button covers the 'Behaviour settings.' title ever so slightly.
1. No confirm or cancel button when editing, only a reset/clear button should be available.