diff --git a/layout/reftests/bugs/374719-1-css.css b/layout/reftests/bugs/374719-1-css.css
new file mode 100644
index 000000000000..403f5c1e1dfe
--- /dev/null
+++ b/layout/reftests/bugs/374719-1-css.css
@@ -0,0 +1,61 @@
+gridlikebox {
+  margin: 2px 4px;
+  background-color: -moz-Field;
+  color: -moz-FieldText;
+  -moz-binding: url('374719-1-xbl.xml#gridlike');
+  -moz-user-focus: normal;
+  -moz-appearance: listbox;
+}
+
+gridlikehead {
+  -moz-binding: url("374719-1-xbl.xml#gridlikehead");
+}
+
+gridlikebox > scrollbox > box {
+  display: -moz-grid;
+}
+
+gridlikecols, gridlikehead, gridlikerows, gridlikeboxbody {
+  display: -moz-grid-group;
+}
+
+gridlikecol, gridlikeitem, gridlikeheaditem {
+  display: -moz-grid-line;
+}
+
+gridlikehead {
+  -moz-box-orient: vertical;
+}
+
+gridlikerows {
+  -moz-box-orient: vertical;
+  -moz-box-flex: 1;
+}
+
+gridlikeboxbody {
+  -moz-box-orient: vertical;
+  -moz-box-flex: 1;
+}
+
+gridlikecol {
+  -moz-box-orient: vertical;
+  min-width: 16px;
+}
+
+gridlikeheader {
+  -moz-binding: url("chrome://global/content/bindings/listbox.xml#listheader");
+  -moz-box-ordinal-group: 2147483646;
+}
+
+gridlikeheader {
+  -moz-appearance: treeheadercell;
+  -moz-box-align: center;
+  border: 2px solid;
+  -moz-border-top-colors: ThreeDHighlight ThreeDLightShadow;
+  -moz-border-right-colors: ThreeDDarkShadow ThreeDShadow;
+  -moz-border-bottom-colors: ThreeDDarkShadow ThreeDShadow;
+  -moz-border-left-colors: ThreeDHighlight ThreeDLightShadow;
+  background-color: -moz-Dialog;
+  color: -moz-DialogText;
+  padding: 0 4px;
+}
diff --git a/layout/reftests/bugs/374719-1-ref.xul b/layout/reftests/bugs/374719-1-ref.xul
new file mode 100644
index 000000000000..1a1fa070d6be
--- /dev/null
+++ b/layout/reftests/bugs/374719-1-ref.xul
@@ -0,0 +1,41 @@
+<?xml version="1.0"?>
+
+<?xml-stylesheet href="chrome://global/skin/global.css"
+                 type="text/css"?>
+<?xml-stylesheet href="374719-1-css.css"
+                 type="text/css"?>
+
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <gridlikebox flex="1">
+    <gridlikecols>
+      <gridlikecol flex="1"/>
+      <gridlikecol flex="1"/>
+    </gridlikecols>
+
+    <gridlikehead>
+      <gridlikeheader label="Col1"/>
+      <gridlikeheader label="Col2"/>
+    </gridlikehead>
+
+    <gridlikeitem value="hello1">
+      <gridlikecell><label value="Hello"/></gridlikecell>
+      <gridlikecell><label value="Hello"/></gridlikecell>
+    </gridlikeitem>
+    <gridlikeitem value="aValue">
+      <gridlikecell><label value="aLabel1"/></gridlikecell>
+      <gridlikecell><label value="aLabel2"/></gridlikecell>
+    </gridlikeitem>
+    <gridlikeitem value="hello2">
+      <gridlikecell><label value="Hello2"/></gridlikecell>
+      <gridlikecell><label value="Hello2.1"/></gridlikecell>
+    </gridlikeitem>
+    <gridlikeitem value="hello3">
+      <gridlikecell><label value="Hello592"/></gridlikecell>
+      <gridlikecell><label value="Hello592.1"/></gridlikecell>
+    </gridlikeitem>
+    <gridlikeitem value="hello4">
+      <gridlikecell><label value="Hello4"/></gridlikecell>
+      <gridlikecell><label value="Hello4--"/></gridlikecell>
+    </gridlikeitem>
+  </gridlikebox>
+</window>
diff --git a/layout/reftests/bugs/374719-1-xbl.xml b/layout/reftests/bugs/374719-1-xbl.xml
new file mode 100644
index 000000000000..b56587c58766
--- /dev/null
+++ b/layout/reftests/bugs/374719-1-xbl.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0"?>
+
+<bindings xmlns="http://www.mozilla.org/xbl"
+          xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+          xmlns:xbl="http://www.mozilla.org/xbl"
+          xmlns:html="http://www.w3.org/1999/xhtml">
+
+  <binding id="gridlike">
+    <content>
+      <xul:scrollbox allowevents="true" orient="vertical" anonid="main-box"
+                     flex="1" style="overflow: auto;">
+        <children includes="gridlikecols">
+          <xul:gridlikecols>
+            <xul:gridlikecol flex="1"/>
+          </xul:gridlikecols>
+        </children>
+        <xul:gridlikerows>
+          <children includes="gridlikehead"/>
+          <xul:gridlikeboxbody xbl:inherits="rows,size,minheight">
+            <children includes="gridlikeitem"/>
+          </xul:gridlikeboxbody>
+        </xul:gridlikerows>
+      </xul:scrollbox>
+    </content>
+  </binding>
+
+  <binding id="gridlikehead">
+    <content>
+      <xul:gridlikeheaditem>
+        <children includes="gridlikeheader"/>
+      </xul:gridlikeheaditem>
+    </content>
+  </binding>
+</bindings>
diff --git a/layout/reftests/bugs/374719-1.xul b/layout/reftests/bugs/374719-1.xul
new file mode 100644
index 000000000000..f007aa729c16
--- /dev/null
+++ b/layout/reftests/bugs/374719-1.xul
@@ -0,0 +1,74 @@
+<?xml version="1.0"?>
+
+<?xml-stylesheet href="chrome://global/skin/global.css"
+                 type="text/css"?>
+<?xml-stylesheet href="374719-1-css.css"
+                 type="text/css"?>
+
+<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+	onload="test2()">
+
+  <script>
+    function test2()
+    {
+      var r = document.getElementById('rbox');
+
+      const XULNS =
+        "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+
+      var item = document.createElementNS(XULNS, "gridlikeitem");
+      item.setAttribute("value", "aValue");
+
+      var cell1 = document.createElementNS(XULNS, "gridlikecell");
+      var label1 = document.createElementNS(XULNS, "label");
+      label1.setAttribute("value", "aLabel1");
+      label1.setAttribute("flex", "1");
+      label1.setAttribute("crop", "end");
+      cell1.appendChild(label1);
+      item.appendChild(cell1);
+
+      var cell2 = document.createElementNS(XULNS, "gridlikecell");
+      var label2 = document.createElementNS(XULNS, "label");
+      label2.setAttribute("value", "aLabel2");
+      label2.setAttribute("flex", "1");
+      label2.setAttribute("crop", "end");
+      cell2.appendChild(label2);
+      item.appendChild(cell2);
+
+      var before = document.getElementById("inx");
+      if (!before)
+        r.appendChild(item);
+      else
+        r.insertBefore(item, before);
+    }
+  </script>
+
+  <gridlikebox flex="1" id="rbox">
+    <gridlikecols>
+      <gridlikecol flex="1"/>
+      <gridlikecol flex="1"/>
+    </gridlikecols>
+
+    <gridlikehead>
+      <gridlikeheader label="Col1"/>
+      <gridlikeheader label="Col2"/>
+    </gridlikehead>
+
+    <gridlikeitem value="hello1">
+      <gridlikecell><label value="Hello"/></gridlikecell>
+      <gridlikecell><label value="Hello"/></gridlikecell>
+    </gridlikeitem>
+    <gridlikeitem value="hello2" id="inx">
+      <gridlikecell><label value="Hello2"/></gridlikecell>
+      <gridlikecell><label value="Hello2.1"/></gridlikecell>
+    </gridlikeitem>
+    <gridlikeitem value="hello3">
+      <gridlikecell><label value="Hello592"/></gridlikecell>
+      <gridlikecell><label value="Hello592.1"/></gridlikecell>
+    </gridlikeitem>
+    <gridlikeitem value="hello4">
+      <gridlikecell><label value="Hello4"/></gridlikecell>
+      <gridlikecell><label value="Hello4--"/></gridlikecell>
+    </gridlikeitem>
+  </gridlikebox>
+</window>
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index f36b3384ed94..4cc71e9258d4 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -560,6 +560,7 @@ random-if(MOZ_WIDGET_TOOLKIT=="gtk2") == 368020-5.html 368020-5-ref.html # bug 3
 == 372768-1.html 372768-1-ref.html
 == 373383-1.html 373383-1-ref.html
 == 374038-1.xul 374038-1-ref.xul
+== 374719-1.xul 374719-1-ref.xul
 == 374038-2.xul 374038-2-ref.xul
 fails == 374927-1.html 374927-1-ref.html # Was broken by patch for bug 368600; fails until bug 400776 is fixed
 == 375716-1.html 375716-1-ref.html