diff --git a/mozilla/layout/html/document/src/forms.css b/mozilla/layout/html/document/src/forms.css
index d5d526490d6..bb968b056b3 100644
--- a/mozilla/layout/html/document/src/forms.css
+++ b/mozilla/layout/html/document/src/forms.css
@@ -244,6 +244,8 @@ textarea[disabled],
 option[disabled],
 optgroup[disabled],
 select[disabled] {
+  -moz-user-input: disabled;
+  -moz-user-focus: ignore;
   color: GrayText;
   background-color: ThreeDFace;
   cursor: default;
diff --git a/mozilla/layout/style/forms.css b/mozilla/layout/style/forms.css
index d5d526490d6..bb968b056b3 100644
--- a/mozilla/layout/style/forms.css
+++ b/mozilla/layout/style/forms.css
@@ -244,6 +244,8 @@ textarea[disabled],
 option[disabled],
 optgroup[disabled],
 select[disabled] {
+  -moz-user-input: disabled;
+  -moz-user-focus: ignore;
   color: GrayText;
   background-color: ThreeDFace;
   cursor: default;