1. In Firefox, the Bookmarks toolbar appears to have one default font/icon size, and it's rather small and unattractive.
By contrast, Chrome's default is a larger and more attractive display.
Ideally Firefox would allow users to customize font size (or implement an option for auto-sizing, so that a certain number of toolbar bookmarks would fill the full toolbar width).
*This is another place where with added customization options, Firefox could easily be more competitive with other browsers.*
2. Notice too that Chrome allows users to customize the home page image, whereas Firefox does not. This would be a simple, super nice upgrade.