How to toggle index & styles tabs fast without using mouse?

I wonder if there is a way to use hot key combinations to toggle on/off the index.html and styles.css tabs (image) in the new Responsive web design curriculum.

I really appreciate as it would help me save lots of time while looking at my code again and again

There aren’t such shortcuts

You can open a feature request on the github repository opening an issue: Issues · freeCodeCamp/freeCodeCamp · GitHub

Thanks for your information ilenia