Tak jsem našel řešení, je to jednoduché. Vše viz obrázek.

https://www.userchrome.org/img/Fx77-prefers-reduced-motion.png

A.) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.
B.) In the search box in the page, type or paste ui.prefersReducedMotion and pause while the list is filtered.
If this preference was already created and shows a value of 0, skip to step D.
C.) On the bar with the preference name, click the radio button next to Number and click the + button to add the preference. Then Firefox should display the new value.
D.) Set the value to 1 (double-click to edit if necessary) and click the blue checkmark button to save the change.