Tries to speedup browsing by disabling CSS content animations
Help page: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion#user_preferences
Overriding Firefox config: in about:config create new pref: ui.prefersReducedMotion set to 1.
Animation is no longer modified to be instant or removed completely - animation curve is modified to instantly jump to the end, but all timers are preserved.
This should reduce side effects listed below.
Because of this, new js-only version is available now https://greasyfork.org/scripts/40529-animalqueryjs Issues may also been fixed in new Firefox releases (66 looks promising)