--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -3651,17 +3651,21 @@ nsLayoutUtils::PaintFrame(gfxContext* aR
 
   Maybe<nsDisplayListBuilder> nonRetainedBuilder;
   Maybe<nsDisplayList> nonRetainedList;
   nsDisplayListBuilder* builderPtr = nullptr;
   nsDisplayList* listPtr = nullptr;
   RetainedDisplayListBuilder* retainedBuilder = nullptr;
 
   const bool buildCaret = !(aFlags & PaintFrameFlags::PAINT_HIDE_CARET);
-  const bool retainDisplayList = gfxPrefs::LayoutRetainDisplayList();
+
+  // Enable display list retaining if the pref is set and if we are in a
+  // content process.
+  const bool retainDisplayList =
+    gfxPrefs::LayoutRetainDisplayList() && XRE_IsContentProcess();
 
   if (retainDisplayList &&
       aBuilderMode == nsDisplayListBuilderMode::PAINTING &&
       (aFlags & PaintFrameFlags::PAINT_WIDGET_LAYERS)) {
     retainedBuilder = aFrame->GetProperty(RetainedDisplayListBuilder::Cached());
 
     if (!retainedBuilder) {
       retainedBuilder =