diff --git a/js/src/gc/Scheduling.h b/js/src/gc/Scheduling.h
index 8c7f36135112..a5be9e158ed3 100644
--- a/js/src/gc/Scheduling.h
+++ b/js/src/gc/Scheduling.h
@@ -387,7 +387,7 @@ static const double HighFrequencyLargeHeapGrowth = 1.5;
 static const double LowFrequencyHeapGrowth = 1.5;
 
 /* JSGC_HEAP_GROWTH_FACTOR */
-static const double HeapGrowthFactor = 40.0;
+static const double HeapGrowthFactor = 50.0;
 
 /* JSGC_MIN_EMPTY_CHUNK_COUNT */
 static const uint32_t MinEmptyChunkCount = 1;
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 81fad1fb9107..0dbfe26d60df 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1044,7 +1044,7 @@ pref("javascript.options.mem.gc_low_frequency_heap_growth", 150);
 pref("javascript.options.mem.gc_balanced_heap_limits", false);
 
 // JSGC_HEAP_GROWTH_FACTOR
-pref("javascript.options.mem.gc_heap_growth_factor", 40);
+pref("javascript.options.mem.gc_heap_growth_factor", 50);
 
 // JSGC_ALLOCATION_THRESHOLD
 pref("javascript.options.mem.gc_allocation_threshold_mb", 27);