The new toolbar layout now has an updated version of the Firefox Sync cloud synchronization service, and a host of other incremental adjustments. Firefox now also uses Mozilla's Firefox Accounts for syncing settings and bookmarks between machines. The new Firefox Accounts uses the usual combination of email and password instead of random codes.
The browser in the new updated version is now more customizable. As part of the update, the “Customize” button is now always present in the new Firefox menu. After clicking on that button, you can move around virtually all of Firefox's user interface. You can now prioritize features in the menu, toolbar, and tab bar by simply dragging them to the desired position.