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I hated the new yt layout. If you want the old one follow this:
Download and install this add-on:
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Then, while you're on the Youtube Homepage, Right click and bring up the "Web-Developer" menu, go to "Cookies" and then "View Cookie Information". Look through your cookies for the one that says "Visitor_Info_Live", click on Edit, then change the "Value" to "qDpUsBNO0FY" (without the quotes). Click "Save" and refresh the homepage. You should now be back to your original homepage.