--- a/gfx/thebes/gfxPlatform.cpp
+++ b/gfx/thebes/gfxPlatform.cpp
@@ -2149,21 +2149,21 @@ gfxPlatform::GetScaledFontForFontWithCai
     }
 
     return nullptr;
 }
 
 /* static */ bool
 gfxPlatform::UsesOffMainThreadCompositing()
 {
-  InitLayersAccelerationPrefs();
   static bool firstTime = true;
   static bool result = false;
 
   if (firstTime) {
+    InitLayersAccelerationPrefs();
     result =
       sPrefBrowserTabsRemoteAutostart ||
       gfxPrefs::LayersOffMainThreadCompositionEnabled() ||
       gfxPrefs::LayersOffMainThreadCompositionForceEnabled();
 #if defined(MOZ_WIDGET_GTK)
     // Linux users who chose OpenGL are being grandfathered in to OMTC
     result |= gfxPrefs::LayersAccelerationForceEnabled();