diff --git a/mozilla/content/shared/public/nsXULAtomList.h b/mozilla/content/shared/public/nsXULAtomList.h
index 75a64d5350a..a46e0eb2944 100644
--- a/mozilla/content/shared/public/nsXULAtomList.h
+++ b/mozilla/content/shared/public/nsXULAtomList.h
@@ -122,3 +122,8 @@ XUL_ATOM(container, "container")
 
 XUL_ATOM(widget, "widget")
 XUL_ATOM(window, "window")
+
+XUL_ATOM(iframe, "iframe")
+XUL_ATOM(browser, "browser")
+XUL_ATOM(editor, "editor")
+
diff --git a/mozilla/layout/xul/content/src/nsXULAtomList.h b/mozilla/layout/xul/content/src/nsXULAtomList.h
index 75a64d5350a..a46e0eb2944 100644
--- a/mozilla/layout/xul/content/src/nsXULAtomList.h
+++ b/mozilla/layout/xul/content/src/nsXULAtomList.h
@@ -122,3 +122,8 @@ XUL_ATOM(container, "container")
 
 XUL_ATOM(widget, "widget")
 XUL_ATOM(window, "window")
+
+XUL_ATOM(iframe, "iframe")
+XUL_ATOM(browser, "browser")
+XUL_ATOM(editor, "editor")
+