How to fix price slider on touch version in firefox?

Question

css

I tried several similar ways to create the price slider I needed, for all mozilla the most problematic - often the z-index for one of the balls does not work. In this method, everything works - in the desktop version of all browsers, including Mozilla, and on mobile versions of all browsers, except Mozilla.
The code is completely from here, except that I don’t have static numbers, but dynamic ones, but if I make a static piece separately, it doesn’t work either, it’s not about php inserts.
https://codepen.io/joosts/pen/rNLdxvK
On the mobile version of Mozilla, the balls do not move.
What could be the problem and how to fix it? To leave this slider.