diff --git a/layout/base/nsCaret.cpp b/layout/base/nsCaret.cpp
index 8ad4359501..eca22f3ba5 100644
--- a/layout/base/nsCaret.cpp
+++ b/layout/base/nsCaret.cpp
@@ -117,6 +117,12 @@ IsBidiUI()
   return Preferences::GetBool("bidi.browser.ui");
 }
 
+static bool
+CjkThickCaret()
+{
+  return Preferences::GetBool("layout.cjkthickcaret");
+}
+
 nsCaret::nsCaret()
 : mOverrideOffset(0)
 , mBlinkCount(-1)
@@ -190,7 +196,7 @@ nsCaret::ComputeMetrics(nsIFrame* aFrame, int32_t aOffset, nscoord aCaretHeight)
     nsPresContext::CSSPixelsToAppUnits(
         LookAndFeel::GetInt(LookAndFeel::eIntID_CaretWidth, 1));
 
-  if (DrawCJKCaret(aFrame, aOffset)) {
+  if (DrawCJKCaret(aFrame, aOffset) && CjkThickCaret()) {
     caretWidth += nsPresContext::CSSPixelsToAppUnits(1);
   }
   nscoord bidiIndicatorSize = nsPresContext::CSSPixelsToAppUnits(kMinBidiIndicatorPixels);
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 2519bf8010..b196a89b84 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5407,6 +5407,9 @@ pref("plugins.navigator_hide_disabled_flash", false);
 // Disable browser frames by default
 pref("dom.mozBrowserFramesEnabled", false);
 
+// Thick caret when behind CJK characters
+pref("layout.cjkthickcaret", true); 
+
 // Is support for 'color-adjust' CSS property enabled?
 pref("layout.css.color-adjust.enabled", true);