diff --git a/layout/generic/crashtests/463350-1.html b/layout/generic/crashtests/463350-1.html
new file mode 100644
index 000000000000..ad5f9158e65b
--- /dev/null
+++ b/layout/generic/crashtests/463350-1.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script type="text/javascript">
+
+function boom()
+{
+  document.getElementById("select").appendChild(document.createElement("span"));
+  document.documentElement.offsetHeight;
+  document.getElementById("z").appendChild(document.createElement("span"));
+}
+
+</script>
+</head>
+
+<body onload="boom();" style="-moz-column-count: 2; height: 72496331mm;"><fieldset><span id="z"><div><div></div></div><select id="select"></select></span></fieldset></body>
+</html>
diff --git a/layout/generic/crashtests/463350-2.html b/layout/generic/crashtests/463350-2.html
new file mode 100644
index 000000000000..a567761d2464
--- /dev/null
+++ b/layout/generic/crashtests/463350-2.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script type="text/javascript">
+
+function boom()
+{
+  document.getElementById("select").appendChild(document.createElement("span"));
+  document.documentElement.offsetHeight;
+  document.getElementById("z").appendChild(document.createElement("span"));
+}
+
+</script>
+</head>
+
+<body onload="boom();" style="-moz-column-count: 2; height: 0;"><fieldset><span id="z"><div><div></div></div><select id="select"></select></span></fieldset></body>
+</html>
diff --git a/layout/generic/crashtests/463350-3.html b/layout/generic/crashtests/463350-3.html
new file mode 100644
index 000000000000..2f75c839b3ef
--- /dev/null
+++ b/layout/generic/crashtests/463350-3.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script type="text/javascript">
+
+function boom()
+{
+  document.getElementById("select").appendChild(document.createElement("span"));
+}
+
+</script>
+</head>
+
+<body onload="setTimeout('boom()', 500);" style="-moz-column-count: 2; height: 0;"><fieldset><span id="z"><div><div></div></div><select id="select"></select></span></fieldset></body>
+</html>
diff --git a/layout/generic/crashtests/473278-1.xhtml b/layout/generic/crashtests/473278-1.xhtml
new file mode 100644
index 000000000000..c4aa34d6bc28
--- /dev/null
+++ b/layout/generic/crashtests/473278-1.xhtml
@@ -0,0 +1 @@
+<html xmlns="http://www.w3.org/1999/xhtml"><head></head><body><mmultiscripts xmlns="http://www.w3.org/1998/Math/MathML" style="clip-path: url(#q); -moz-transform: translate(100px, 100px);"/></body></html>
diff --git a/layout/generic/crashtests/493118-1.html b/layout/generic/crashtests/493118-1.html
new file mode 100644
index 000000000000..0ab7fa52109b
--- /dev/null
+++ b/layout/generic/crashtests/493118-1.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml" style="-moz-column-count: 2;">
+<body style="padding: 731563462617733px; height: 10px;">
+<div></div>
+</body>
+</html>
diff --git a/layout/generic/crashtests/crashtests.list b/layout/generic/crashtests/crashtests.list
index bf42259f16e5..c2a01693739c 100644
--- a/layout/generic/crashtests/crashtests.list
+++ b/layout/generic/crashtests/crashtests.list
@@ -220,6 +220,9 @@ load 455171-3.html
 load 455643-1.xhtml
 load 457375.html
 load 457380-1.html
+load 463350-1.html
+load 463350-2.html
+load 463350-3.html
 load 463741-1.html
 load 465651-1.html
 load 467487-1.html
@@ -230,11 +233,13 @@ load 472587-1.xhtml
 load 472774-1.html
 load 472776-1.html
 load 472950-1.html
+load 473278-1.xhtml
 load 477928.html
 load 478170-1.html
 load 478185-1.html
 load 479938-1.html
 load 480345-1.html
+load 493118-1.html
 load 494332-1.html
 load 501535-1.html
 load 505912-1.html
