Investigate whether Animations(Player) API provides new high resolution timestamp

The Animation(Player) API got implemented (https://developer.mozilla.org/en-US/docs/Web/API/Animation) and may provide a new high resolution timestamp. If so, make sure to reduce its granularity respectively. This is behind a pref, dom.animations-api.core.enabled in Firefox 38 ESR. Thus, deferring to Firefox 45 ESR.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information