diff --git a/layout/base/PresShell.cpp b/layout/base/PresShell.cpp
index 9e006823d902..a82ec68236e4 100644
--- a/layout/base/PresShell.cpp
+++ b/layout/base/PresShell.cpp
@@ -5820,16 +5820,8 @@ void PresShell::DoUpdateApproximateFrameVisibility(bool aRemoveOnly) {
 }
 
 bool PresShell::AssumeAllFramesVisible() {
-  static bool sFrameVisibilityEnabled = true;
-  static bool sFrameVisibilityPrefCached = false;
-
-  if (!sFrameVisibilityPrefCached) {
-    Preferences::AddBoolVarCache(&sFrameVisibilityEnabled,
-                                 "layout.framevisibility.enabled", true);
-    sFrameVisibilityPrefCached = true;
-  }
-
-  if (!sFrameVisibilityEnabled || !mPresContext || !mDocument) {
+  if (!StaticPrefs::layout_framevisibility_enabled() || !mPresContext ||
+      !mDocument) {
     return true;
   }
 
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index 6f09de2670a9..eea2978e0b43 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -6016,6 +6016,12 @@
   value: true
   mirror: always
 
+# Whether frame visibility tracking is enabled globally.
+- name: layout.framevisibility.enabled
+  type: bool
+  value: true
+  mirror: always
+
 # The fraction of the scrollport we allow to horizontally scroll by before we
 # schedule an update of frame visibility.
 - name: layout.framevisibility.amountscrollbeforeupdatehorizontal
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 65438672e775..1f1f29e3a815 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -918,9 +918,6 @@ pref("nglayout.enable_drag_images", true);
 pref("nglayout.debug.paint_flashing", false);
 pref("nglayout.debug.paint_flashing_chrome", false);
 
-// Whether frame visibility tracking is enabled globally.
-pref("layout.framevisibility.enabled", true);
-
 pref("layout.framevisibility.numscrollportwidths", 0);
 pref("layout.framevisibility.numscrollportheights", 1);