Giving selected navigation tabs dropdown menus

Giving selected navigation tabs dropdown menus

NOTE: The privateTabs area (username, inbox, alerts, logout) already have dropdown menus (save for logout, but I don't think the logout should have a dropdown). So you have to use your best judgement here. For me, I just remove the tablinks for these tabs, since the links shown (Personal Details, Conversations, Your News Feed, Likes You've Received) all show up under the username dropdown anyways).
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