Glider not displayed in Firefox

Hello OoohBoi,

there is a strange behaviour in Feirefox (not in Crome or Safari). The slider is sometimes not displayed at all, even after a simple page refresh. Strangely, no error message appears in the browser console. This error occurs very sporadically, sometimes you have to refresh the page several times in a row to reproduce the error.

I have found out that in such cases certain class names (swiper-slide-visible swiper-slide-active) are missing on the slide element. To be able to display at least the first slide, I added the following CSS
”’
.swiper-wrapper .swiper-slide:first-child {
visibility: visible;
}
”’

I look forward to hearing from you.
Thank you very much for your help.

The page I need help with: [log in to see the link]