--- a/layout/base/AccessibleCaretManager.cpp
+++ b/layout/base/AccessibleCaretManager.cpp
@@ -60,16 +60,18 @@ std::ostream& operator<<(std::ostream& a
     AC_PROCESS_ENUM_TO_STREAM(UpdateCaretsHint::Default);
     AC_PROCESS_ENUM_TO_STREAM(UpdateCaretsHint::RespectOldAppearance);
   }
   return aStream;
 }
 #undef AC_PROCESS_ENUM_TO_STREAM
 
 /*static*/ bool
+AccessibleCaretManager::sSelectionBarEnabled = false;
+/*static*/ bool
 AccessibleCaretManager::sCaretsExtendedVisibility = false;
 /*static*/ bool
 AccessibleCaretManager::sHapticFeedback = false;
 
 AccessibleCaretManager::AccessibleCaretManager(nsIPresShell* aPresShell)
   : mPresShell(aPresShell)
 {
   if (!mPresShell) {
@@ -78,16 +80,18 @@ AccessibleCaretManager::AccessibleCaretM
 
   mFirstCaret = MakeUnique<AccessibleCaret>(mPresShell);
   mSecondCaret = MakeUnique<AccessibleCaret>(mPresShell);
 
   mCaretTimeoutTimer = do_CreateInstance("@mozilla.org/timer;1");
 
   static bool addedPrefs = false;
   if (!addedPrefs) {
+    Preferences::AddBoolVarCache(&sSelectionBarEnabled,
+                                 "layout.accessiblecaret.bar.enabled");
     Preferences::AddBoolVarCache(&sCaretsExtendedVisibility,
                                  "layout.accessiblecaret.extendedvisibility");
     Preferences::AddBoolVarCache(&sHapticFeedback,
                                  "layout.accessiblecaret.hapticfeedback");
     addedPrefs = true;
   }
 }
 
@@ -314,17 +318,17 @@ AccessibleCaretManager::UpdateCaretsForS
     HideCarets();
     return;
   }
 
   auto updateSingleCaret = [](AccessibleCaret* aCaret, nsIFrame* aFrame,
                               int32_t aOffset) -> PositionChangedResult
   {
     PositionChangedResult result = aCaret->SetPosition(aFrame, aOffset);
-    aCaret->SetSelectionBarEnabled(true);
+    aCaret->SetSelectionBarEnabled(sSelectionBarEnabled);
 
     switch (result) {
       case PositionChangedResult::NotChanged:
         // Do nothing
         break;
 
       case PositionChangedResult::Changed:
         aCaret->SetAppearance(Appearance::Normal);

--- a/layout/base/AccessibleCaretManager.h
+++ b/layout/base/AccessibleCaretManager.h
@@ -242,16 +242,20 @@ protected:
   static const int32_t kAutoScrollTimerDelay = 30;
 
   // Clicking on the boundary of input or textarea will move the caret to the
   // front or end of the content. To avoid this, we need to deflate the content
   // boundary by 61 app units, which is 1 pixel + 1 app unit as defined in
   // AppUnit.h.
   static const int32_t kBoundaryAppUnits = 61;
 
+  // Preference to show selection bars at the two ends in selection mode. The
+  // selection bar is always disabled in cursor mode.
+  static bool sSelectionBarEnabled;
+
   // AccessibleCaret visibility preference. Used to avoid hiding caret during
   // (NO_REASON) selection change notifications generated by keyboard IME, and to
   // maintain a visible ActionBar while carets NotShown during scroll and while
   // cursor is on an empty input.
   static bool sCaretsExtendedVisibility;
 
   // AccessibleCaret pref for haptic feedback behaviour on longPress.
   static bool sHapticFeedback;

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -4909,16 +4909,19 @@ pref("snav.enabled", false);
 pref("layout.accessiblecaret.enabled", false);
 
 // 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");
 pref("layout.accessiblecaret.bar.width", "2.0");
 
+// Show the selection bars at the two ends of the selection highlight.
+pref("layout.accessiblecaret.bar.enabled", true);
+
 // Timeout in milliseconds to hide the accessiblecaret under cursor mode while
 // no one touches it. Set the value to 0 to disable this feature.
 pref("layout.accessiblecaret.timeout_ms", 3000);
 
 // Simulate long tap to select words on the platforms where APZ is not enabled
 // or long tap events does not fired by APZ.
 pref("layout.accessiblecaret.use_long_tap_injector", true);