--- a/gfx/layers/LayerSorter.cpp
+++ b/gfx/layers/LayerSorter.cpp
@@ -151,17 +151,17 @@ static LayerSortOrder CompareDepth(Layer
 
     gfxFloat difference = otherDepth - ourDepth;
 
     if (fabs(difference) > fabs(highest)) {
       highest = difference;
     }
   }
   // If layers have the same depth keep the original order
-  if (highest >= 0) {
+  if (fabs(highest) < 0.1 || highest >= 0) {
     return ABeforeB;
   } else {
     return BBeforeA;
   }
 }
 
 #ifdef DEBUG
 static bool gDumpLayerSortList = getenv("MOZ_DUMP_LAYER_SORT_LIST") != 0;