diff --git a/mozilla/layout/base/crashtests/372550-1.html b/mozilla/layout/base/crashtests/372550-1.html
new file mode 100644
index 00000000000..a1dd8ea5b8b
--- /dev/null
+++ b/mozilla/layout/base/crashtests/372550-1.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <style>
+    div#x::first-letter { color: blue; }
+  </style>
+</head>
+<body>
+<div id="x">x</div>
+<script>
+  document.body.offsetWidth;
+  var div = document.getElementById("x");
+  div.id = "y";
+  div.removeChild(div.firstChild);
+</script>
+</body>
+</html>
diff --git a/mozilla/layout/base/crashtests/crashtests.list b/mozilla/layout/base/crashtests/crashtests.list
index 500e8919c47..5dd959f57fe 100644
--- a/mozilla/layout/base/crashtests/crashtests.list
+++ b/mozilla/layout/base/crashtests/crashtests.list
@@ -15,5 +15,6 @@ load 350128-1.xhtml
 load 364427-1.html
 load 366967-1.html
 load 372237-1.html
+load 372550-1.html
 load 379920-1.svg
-load 379920-1.svg
+load 379920-2.svg
