Youtube++ Cercube - a tweaked version of Youtube which includes:

• Download any video in any available quality (from 144p to 2160p)
• View, manage and share all your downloads in Cercube's download manager
• Block ads
• Share downloaded videos with other devices via AirDrop
• Background playback for streamed and downloaded videos
• Downloaded videos are displayed within a beautifully crafted downloads manager that shows all the available information
• Choose the default tab to open when launching YouTube
• Auto-replay videos
• Hide the Trending tab
• Rewind or forward videos
• Cercube options are configurable from within YouTube settings