diff --git a/layout/style/crashtests/1382672.html b/layout/style/crashtests/1382672.html
new file mode 100644
index 000000000000..9e8eea5baec6
--- /dev/null
+++ b/layout/style/crashtests/1382672.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<script>
+window.onload = () => {
+  document.documentElement.animate([ { "font": "-moz-desktop" }, { "font": "message-box" } ])
+}
+</script>
+</head>
+</html>
diff --git a/layout/style/crashtests/crashtests.list b/layout/style/crashtests/crashtests.list
index ff16e2def04d..a7a43c5af53b 100644
--- a/layout/style/crashtests/crashtests.list
+++ b/layout/style/crashtests/crashtests.list
@@ -183,3 +183,4 @@ load 1378814.html
 load 1380800.html
 load link-transition-before.html
 load 1381682.html
+load 1382672.html
