diff --git a/layout/html/document/src/html.css b/layout/html/document/src/html.css
index 5ec44b9ff7c1..a000c7b7be3d 100644
--- a/layout/html/document/src/html.css
+++ b/layout/html/document/src/html.css
@@ -358,6 +358,10 @@ img[usemap], object[usemap] {
   -moz-user-focus: normal;
 }
 
+object, embed, applet {
+  -moz-user-focus: normal;
+}
+
 frameset {
   display: block ! important;
   overflow: hidden;
diff --git a/layout/style/html.css b/layout/style/html.css
index 5ec44b9ff7c1..a000c7b7be3d 100644
--- a/layout/style/html.css
+++ b/layout/style/html.css
@@ -358,6 +358,10 @@ img[usemap], object[usemap] {
   -moz-user-focus: normal;
 }
 
+object, embed, applet {
+  -moz-user-focus: normal;
+}
+
 frameset {
   display: block ! important;
   overflow: hidden;