Flickering in Firefox on Windows

Hi. On some configurations the slideshow starts flickering heavily. E.g. on Firefox on Windows. I got some different devices here so:

Firefox / Windows 7→ flickering
Chrome and Opera / Windows 7 → fine
Firefox / Android → fine
Safari / iPad and iMac→ fine

It gets worse on slower devices but still happens on my fast mashine.

It occurs only in Firefox on Windows and since I live in a country where almost everyone is using Firefox (Germany) please have look at this.

Thank you in advance!

Hi Daniel Kloer,
Thanks for contacting us and choosing our product!
I will check the problem you say. thank you.

Thank you but It's still flickering on different devices, Windows + Firefox.

Please fix it!
Thank you in advance

I tried other browsers on linux. All is fine but not on most windows + firefox mashines.
I know it has not a high priority for you but here in Germany almost everyone uses firefox with windows and can not go online with it.