This extension hides/reveals chat list content with a click of a button.
Once you (manually) install this extension and reload https://whatsapp.com, you will see a new button on the top bar. Once you press the "secret button", all chats in the chat list will switch to "hidden" mode.
"Hidden" mode sets a certain opaque value on all chats. On hover however, the hovered chat-box will come back to full opacity, except for the latest text message (which is shown on every chat-box) which will be visible only when hovering specificity on it.
Notice: WhatsApp is a trademark of WhatsApp Inc. registered in the U.S. and other countries. This extension is an independent project and has no relationship to WhatsApp.