diff --git a/src/wp-admin/css/about.css b/src/wp-admin/css/about.css
index c9d6f16aa4..5b6c501aea 100644
--- a/src/wp-admin/css/about.css
+++ b/src/wp-admin/css/about.css
@@ -260,10 +260,8 @@
 
 .about-wrap .two-col-text {
 	-webkit-column-count: 2;
-	-moz-column-count: 2;
 	column-count: 2;
 	-webkit-column-gap: 40px;
-	-moz-column-gap: 40px;
 	column-gap: 40px;
 }
 
@@ -551,7 +549,6 @@
 @media screen and (max-width: 782px) {
 	.about-wrap .two-col-text {
 		-webkit-column-count: 1;
-		-moz-column-count: 1;
 		column-count: 1;
 	}