diff --git a/mozilla/layout/generic/crashtests/388709-1.html b/mozilla/layout/generic/crashtests/388709-1.html
new file mode 100644
index 00000000000..29d01955ba7
--- /dev/null
+++ b/mozilla/layout/generic/crashtests/388709-1.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+<style>
+#d:after { content: 'a'; }
+#d:first-letter { float: right; }
+</style>
+</head>
+
+<body>
+<div id="d"></div>
+</body>
+
+</html>
diff --git a/mozilla/layout/generic/crashtests/391894-1.html b/mozilla/layout/generic/crashtests/391894-1.html
new file mode 100644
index 00000000000..2753e8511c4
--- /dev/null
+++ b/mozilla/layout/generic/crashtests/391894-1.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+
+<style>
+
+#q:first-line { }
+
+</style>
+
+</head>
+<body style="-moz-column-width: 0em">
+
+<div id="q">a b c<span style="float: right;"></span></div>
+
+</body>
+</html>
diff --git a/mozilla/layout/generic/crashtests/crashtests.list b/mozilla/layout/generic/crashtests/crashtests.list
index 8414d46cca4..28ba941f1bd 100644
--- a/mozilla/layout/generic/crashtests/crashtests.list
+++ b/mozilla/layout/generic/crashtests/crashtests.list
@@ -23,6 +23,7 @@ load 390050-1.html
 load 390050-2.html
 load 390050-3.html
 load 390762-1.html
+load 391894-1.html
 load 393758-1.xhtml
 load 393906-1.html
 load 404204-1.html
