diff --git a/mozilla/layout/mathml/base/src/mathfont.properties b/mozilla/layout/mathml/base/src/mathfont.properties
index adbd9998503..2b014568371 100644
--- a/mozilla/layout/mathml/base/src/mathfont.properties
+++ b/mozilla/layout/mathml/base/src/mathfont.properties
@@ -240,6 +240,7 @@ operator.\u2261.infix = lspace:thickmathspace rspace:thickmathspace # &Congruent
 operator.\u224D.infix = lspace:thickmathspace rspace:thickmathspace # ≍
 operator.\u2250.infix = lspace:thickmathspace rspace:thickmathspace # ≐
 operator.\u2225.infix = stretchy:vertical lspace:thickmathspace rspace:thickmathspace # ∥
+operator.\u2016.infix = stretchy:vertical lspace:thickmathspace rspace:thickmathspace # ‖ ‖
 operator.\u2A75.infix = lspace:thickmathspace rspace:thickmathspace # ⩵
 operator.\u2242.infix = lspace:thickmathspace rspace:thickmathspace # ≂
 operator.\u21CC.infix = stretchy:horizontal lspace:thickmathspace rspace:thickmathspace # ⇌
@@ -463,6 +464,8 @@ operator.\u23B5.postfix = stretchy:horizontal accent:true lspace:0em rspace:0em
 operator.\uFE36.postfix = stretchy:horizontal accent:true lspace:0em rspace:0em # ⏝
 operator.\u2225.prefix = stretchy:vertical fence:true lspace:.0em rspace:.0em # ∥
 operator.\u2225.postfix = stretchy:vertical fence:true lspace:.0em rspace:.0em # ∥
+operator.\u2016.prefix = stretchy:vertical fence:true lspace:.0em rspace:.0em # ‖ ‖
+operator.\u2016.postfix = stretchy:vertical fence:true lspace:.0em rspace:.0em # ‖ ‖
 operator.\u2223.prefix = stretchy:vertical fence:true lspace:.0em rspace:.0em # ∣
 operator.\u2223.postfix = stretchy:vertical fence:true lspace:.0em rspace:.0em # ∣
 operator.\u007C.prefix = stretchy:vertical fence:true lspace:.0em rspace:.0em # |
diff --git a/mozilla/layout/mathml/base/src/mathfontCMEX10.properties b/mozilla/layout/mathml/base/src/mathfontCMEX10.properties
index af01341b7bc..11e01fc65fa 100644
--- a/mozilla/layout/mathml/base/src/mathfontCMEX10.properties
+++ b/mozilla/layout/mathml/base/src/mathfontCMEX10.properties
@@ -100,3 +100,6 @@ mathfont = CMEX10
 
 # Make | behave like VerticalBar because most people use | for fences
 \u007C = \uFFFD\uFFFD\uFFFD\u2223.G\u007C # |
+
+#Make Vert behave like DoubleVerticalBar
+\u2016 = \uFFFD\uFFFD\uFFFD\u2225.G\u2016\u2225.1\u2225.2\u2225.3 # Vert, Verbar
diff --git a/mozilla/layout/mathml/base/src/mathfontMath2.properties b/mozilla/layout/mathml/base/src/mathfontMath2.properties
index 7af6b6fdbde..54e98bed06d 100644
--- a/mozilla/layout/mathml/base/src/mathfontMath2.properties
+++ b/mozilla/layout/mathml/base/src/mathfontMath2.properties
@@ -88,3 +88,6 @@ mathfont = Math2
 \u20D6 = \u20D6\uFFFD\uFFFD\uF8FF\u20D6 
 \u20D7 = \uFFFD\uFFFD\u20D7\uF8FF\u20D7 
 \u20E1 = \u20D6\uFFFD\u20D7\uF8FF\u20E1 
+
+#Make Vert behave like DoubleVerticalBar
+\u2016 = \uFFFD\uFFFD\uFFFD\u2225.G\u2016\u2225.1\u2225.2\u2225.3 # Vert, Verbar