Tracking bug: https://bugzilla.mozilla.org/show_bug.cgi?id=909154
APIs to be removed: mozRequestAnimationFrame, mozAnimationStartTime,
mozCancelAnimationFrame.
As of today, they are not used in our tree.
Web compat impact for mozRequestAnimationFrame/mozCancelAnimationFrame:
Not known for sure, but expected to be small to none. Pretty much any
real-life web code that uses this API will also used the unprefixed
version or at worst fall back to setTimeout/setInterval. Unfortunately,
a use counter would not help much here because of web sites that prefer
using the prefixed version to the unprefixed one.
Web compat impact for mozAnimationStartTime: I expect none, since no
other browser supports anything like it.
Extension compat impact: There are some extensions using
mozCancelAnimationFrame and mozAnimationStartTime but not very many and
they should be easy to update. There are _lots_ of extensions with hits
on mozRequestAnimationFrame but most of those seem to be a comment in
the add-on SDK and various web libraries. Again, I expect any
extensions that _do_ solely use mozRequestAnimationFrame to be easy to
update, but hunting them down might be a bit of work...
-Boris
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