hmm sorry now suddenly this error disappear but as you know there was an issue there..you could click on the slide images but the slider didnt show the new image above and images didnt slide automatically
If you click on image - you didn't get it zoomed. I disable this option. When click - appeared two arrows to show next or previous image.
Clicking on image doesn't show next image.
Below the image there are thumbnails to scroll.
And automatic playing slideshow is active.
I didn't reproduce your problem. Firefox 65.0