Swiper Slides permanently changing width

[marco910]

I'm using Swiper version 8.0.7 in a React project and having some trouble with the slider in Firefox (macOS, Firefox version 103.0).

If I open up the page where Swiper is used in Firefox the width of each slide is permanently changing. This only happens in Firefox and no other browser. There are no console errors or anything else which gives and idea of what goes wrong.
Here's a screen recording of the issue:

Bildschirmaufnahme.2022-08-01.um.17.21.46.mov

Any ideas how I can fix this?