ḑàt҉a͝r̶òt̸@drumsetmonkey Firefox is Fennec Browser on F-droid, Youtube client is NewPipe or Skytube, Whatsapp isn't on F-droid but Telegram is, for a basic email client you can use K-9 Mail. For Twitter you can use SlimSocial, Twitlatte or Twidere. For Android Keyboard or G-Board I use Simple Keyboard.
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