We noticed after we updated to WP 4.9 Lightgallery slider kind of lost its smoothness during transition from one slide to another. On Chrome it looks good and smooth, but on Firefox the slide lost its smoothness during tansition…
Hi Przemek,
Honestly, we have not noticed anything like that in our sites or yours.
Especially that recent Firefox seems to be a major step forward when it comes to speed and performance (and we love to use it)