So ...

We are going to use a plugin called Tabs Shortcode and Widget.

Here it is:

https://wordpress.org/plugins/tabs-shortcode-and-widget/

It's a medium-size plugin (970 KB), so let's start with the usual speed tests ...

Here are my results before installing the plugin ...

... and the result after installing and activating the plugin:

As you can see, it's definitely a well-coded plugin, because is almost invisible ...

So, let's see how it works ...