diff --git a/themes/classic/messenger/addressbook/addressPanes.css b/themes/classic/messenger/addressbook/addressPanes.css
index 278fc9dd3b39..ed7a67c450a0 100644
--- a/themes/classic/messenger/addressbook/addressPanes.css
+++ b/themes/classic/messenger/addressbook/addressPanes.css
@@ -47,3 +47,10 @@ treechildren:-moz-tree-image(DirCol, IsRemote-true, IsSecure-true) {
   list-style-image: url("chrome://messenger/skin/addressbook/icons/secure-remote-addrbook.gif");
 }
 
+#dirTree [sortDirection="ascending"] {
+  list-style-image: none;
+}
+
+#dirTree [sortDirection="descending"] {
+  list-style-image: none;
+}
diff --git a/themes/classic/messenger/folderPane.css b/themes/classic/messenger/folderPane.css
index 8e199876321e..94af9e00c28f 100644
--- a/themes/classic/messenger/folderPane.css
+++ b/themes/classic/messenger/folderPane.css
@@ -170,3 +170,10 @@ treechildren:-moz-tree-image(syncCol, isServer-true) {
   text-align: right;
 }
 
+#folderNameCol [sortDirection="ascending"] {
+  list-style-image: none;
+}
+
+#folderNameCol [sortDirection="descending"] {
+  list-style-image: none;
+}
diff --git a/themes/modern/messenger/addressbook/addressPanes.css b/themes/modern/messenger/addressbook/addressPanes.css
index f210b28cea84..d1b4813d7989 100644
--- a/themes/modern/messenger/addressbook/addressPanes.css
+++ b/themes/modern/messenger/addressbook/addressPanes.css
@@ -61,3 +61,10 @@ treechildren:-moz-tree-image(DirCol, IsRemote-true, IsSecure-true) {
   list-style-image: url("chrome://messenger/skin/addressbook/icons/secure-directory.gif");
 }
 
+#dirTree [sortDirection="ascending"] {
+  list-style-image: none;
+}
+
+#dirTree [sortDirection="descending"] {
+  list-style-image: none;
+}
diff --git a/themes/modern/messenger/folderPane.css b/themes/modern/messenger/folderPane.css
index ab1932701260..25f09af66f7c 100644
--- a/themes/modern/messenger/folderPane.css
+++ b/themes/modern/messenger/folderPane.css
@@ -182,3 +182,10 @@ treechildren:-moz-tree-image(syncCol, isServer-true) {
   text-align: right;
 }
 
+#folderNameCol [sortDirection="ascending"] {
+  list-style-image: none;
+}
+
+#folderNameCol [sortDirection="descending"] {
+  list-style-image: none;
+}