View Taskbar Thumbnails using keyboard
Here is a simple to achieve the same with the help of the keyboard. Keep pressing the Windows+T key and you will see the focus shifting from the left-most icon and moving towards the right side. In the image above, the focus is on the Firefox icon and I have pointed out to the white dot below the Firefox icon. Alternatively, you could just press Windows+T once and leave. Then use the arrow keys to move the focus. Hope this makes working with Windows easier!