As you may know, Firefox 57 comes with a new user interface, known as "Photon". It is intended to provide a more modern, sleek feel that’s consistent across multiple platforms. It replaced the previous "Australis" UI and features new menus, a new customization pane and tabs without rounded corners. Like the New Tab page, the Library menu comes with "Highlights". If you are unhappy to see them, you can quickly disable them.
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