new file mode 100644
--- /dev/null
+++ b/layout/generic/crashtests/435529.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<style type="text/css">
+
+ div {
+ -moz-column-count: 2;
+ white-space: pre;
+ }
+
+ div:first-letter {
+ float: right;
+ }
+
+</style>
+</head>
+
+<body><div> <span>AB</span></div></body>
+
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/generic/crashtests/436823.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+</head>
+<body>
+
+<div style="-moz-column-count: -1;"><div style="float: left;"><div><div style="float: left;">A B</div><div style="clear: both; height: 1px;"></div></div></div></div>
+
+</body>
+</html>
--- a/layout/generic/crashtests/crashtests.list
+++ b/layout/generic/crashtests/crashtests.list
@@ -149,16 +149,18 @@ load 421404-1.html
load 422283-1.html
load 422301-1.html
load 423055-1.html
load 425253-1.html
load 426272-1.html
load 428263-1.html
load 429981-1.html
load 430352-1.html
+load 435529.html
+load 436823.html
load 437156-1.html
load 438259-1.html
load 438509-1.html
load 443528-1.html
load 448903-1.html
load 451334-1.html
load 452157-1.html
load 452157-2.html