diff --git a/layout/base/AccessibleCaret.cpp b/layout/base/AccessibleCaret.cpp
index 3a317782fe9e..ab6e2741d144 100644
--- a/layout/base/AccessibleCaret.cpp
+++ b/layout/base/AccessibleCaret.cpp
@@ -8,7 +8,7 @@
 
 #include "AccessibleCaretLogger.h"
 #include "mozilla/FloatingPoint.h"
-#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs.h"
 #include "mozilla/ToString.h"
 #include "nsCanvasFrame.h"
 #include "nsCaret.h"
@@ -30,10 +30,6 @@ using namespace dom;
 
 NS_IMPL_ISUPPORTS(AccessibleCaret::DummyTouchListener, nsIDOMEventListener)
 
-float AccessibleCaret::sWidth = 0.0f;
-float AccessibleCaret::sHeight = 0.0f;
-float AccessibleCaret::sMarginLeft = 0.0f;
-
 NS_NAMED_LITERAL_STRING(AccessibleCaret::sTextOverlayElementId, "text-overlay");
 NS_NAMED_LITERAL_STRING(AccessibleCaret::sCaretImageElementId, "image");
 
@@ -78,14 +74,6 @@ AccessibleCaret::AccessibleCaret(nsIPresShell* aPresShell)
     MOZ_ASSERT(mPresShell->GetDocument());
     InjectCaretElement(mPresShell->GetDocument());
   }
-
-  static bool prefsAdded = false;
-  if (!prefsAdded) {
-    Preferences::AddFloatVarCache(&sWidth, "layout.accessiblecaret.width");
-    Preferences::AddFloatVarCache(&sHeight, "layout.accessiblecaret.height");
-    Preferences::AddFloatVarCache(&sMarginLeft, "layout.accessiblecaret.margin-left");
-    prefsAdded = true;
-  }
 }
 
 AccessibleCaret::~AccessibleCaret()
@@ -316,11 +304,12 @@ AccessibleCaret::SetCaretElementStyle(const nsRect& aRect, float aZoomLevel)
                         nsPresContext::AppUnitsToIntCSSPixels(position.y));
   // We can't use AppendPrintf here, because it does locale-specific
   // formatting of floating-point values.
-  styleStr.AppendFloat(sWidth/aZoomLevel);
+  styleStr.AppendFloat(StaticPrefs::layout_accessiblecaret_width() / aZoomLevel);
   styleStr.AppendLiteral("px; height: ");
-  styleStr.AppendFloat(sHeight/aZoomLevel);
+  styleStr.AppendFloat(StaticPrefs::layout_accessiblecaret_height() / aZoomLevel);
   styleStr.AppendLiteral("px; margin-left: ");
-  styleStr.AppendFloat(sMarginLeft/aZoomLevel);
+  styleStr.AppendFloat(
+    StaticPrefs::layout_accessiblecaret_margin_left() / aZoomLevel);
   styleStr.AppendLiteral("px");
 
   CaretElement().SetAttr(kNameSpaceID_None, nsGkAtoms::style, styleStr, true);
diff --git a/layout/base/AccessibleCaret.h b/layout/base/AccessibleCaret.h
index b8a15de09e20..f21b20218aea 100644
--- a/layout/base/AccessibleCaret.h
+++ b/layout/base/AccessibleCaret.h
@@ -229,9 +229,6 @@ protected:
   RefPtr<DummyTouchListener> mDummyTouchListener{new DummyTouchListener()};
 
   // Static class variables
-  static float sWidth;
-  static float sHeight;
-  static float sMarginLeft;
   static const nsLiteralString sTextOverlayElementId;
   static const nsLiteralString sCaretImageElementId;
 
diff --git a/modules/libpref/init/StaticPrefList.h b/modules/libpref/init/StaticPrefList.h
index 33dc9faed20a..381181255e5b 100644
--- a/modules/libpref/init/StaticPrefList.h
+++ b/modules/libpref/init/StaticPrefList.h
@@ -446,6 +446,26 @@ VARCACHE_PREF(
 // Layout prefs
 //---------------------------------------------------------------------------
 
+// CSS attributes (width, height, margin-left) of the AccessibleCaret in CSS
+// pixels.
+VARCACHE_PREF(
+  "layout.accessiblecaret.width",
+   layout_accessiblecaret_width,
+  float, 34.0f
+)
+
+VARCACHE_PREF(
+  "layout.accessiblecaret.height",
+   layout_accessiblecaret_height,
+  float, 36.0f
+)
+
+VARCACHE_PREF(
+  "layout.accessiblecaret.margin-left",
+   layout_accessiblecaret_margin_left,
+  float, -18.5f
+)
+
 // Is parallel CSS parsing enabled?
 VARCACHE_PREF(
   "layout.css.parsing.parallel",
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index a14f14a599fd..816718fdb5aa 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5525,11 +5525,6 @@ pref("layout.accessiblecaret.enabled", false);
 // overriding the layout.accessiblecaret.enabled pref.
 pref("layout.accessiblecaret.enabled_on_touch", true);
 
-// CSS attributes of the AccessibleCaret in CSS pixels.
-pref("layout.accessiblecaret.width", "34.0");
-pref("layout.accessiblecaret.height", "36.0");
-pref("layout.accessiblecaret.margin-left", "-18.5");
-
 // Show the caret when long tapping on an empty content.
 pref("layout.accessiblecaret.caret_shown_when_long_tapping_on_empty_content", false);