--- a/layout/base/RestyleManager.cpp
+++ b/layout/base/RestyleManager.cpp
@@ -1525,28 +1525,25 @@ ElementRestyler::ElementRestyler(nsPresC
   , mVisibleKidsOfHiddenElement(aVisibleKidsOfHiddenElement)
 #endif
 {
 }
 
 void
 ElementRestyler::AddLayerChangesForAnimation()
 {
-  // Bug 847286 - We should have separate animation generation counters
-  // on layers for transitions and animations and use != comparison below
-  // rather than a > comparison.
   uint64_t frameGeneration =
     RestyleManager::GetAnimationGenerationForFrame(mFrame);
 
   nsChangeHint hint = nsChangeHint(0);
   for (const LayerAnimationInfo::Record& layerInfo :
          LayerAnimationInfo::sRecords) {
     Layer* layer =
       FrameLayerBuilder::GetDedicatedLayer(mFrame, layerInfo.mLayerType);
-    if (layer && frameGeneration > layer->GetAnimationGeneration()) {
+    if (layer && frameGeneration != layer->GetAnimationGeneration()) {
       // If we have a transform layer but don't have any transform style, we
       // probably just removed the transform but haven't destroyed the layer
       // yet. In this case we will add the appropriate change hint
       // (nsChangeHint_UpdateContainingBlock) when we compare style contexts
       // so we can skip adding any change hint here. (If we *were* to add
       // nsChangeHint_UpdateTransformLayer, ApplyRenderingChangeToTree would
       // complain that we're updating a transform layer without a transform).
       if (layerInfo.mLayerType == nsDisplayItem::TYPE_TRANSFORM &&