It is a handy browser extension that can help you manage the WhatsApp web theme on your device. The extension automatically switches between the light and dark themes depending on the time of day, should you set it to do so. This means you don't need to worry about manually changing the theme every time you open the app.

It's a simple matter to install and use the extension. To change the theme, tap on the icon and you can choose between the two themes that you prefer.