diff -r 000000000000 -r 6474c204b198 dom/locales/en-US/chrome/layout/xbl.properties
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/locales/en-US/chrome/layout/xbl.properties	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+UnexpectedElement=Unexpected <%1$S> element.
+# LOCALIZATION NOTE: do not localize key="%S" modifiers="%S"
+GTK2Conflict=Key event not available on GTK2: key="%S" modifiers="%S"
+WinConflict=Key event not available on some keyboard layouts: key="%S" modifiers="%S"
+TooDeepBindingRecursion=The XBL binding "%S" is already used by too many ancestor elements; not applying it to prevent infinite recursion.
+CircularExtendsBinding=Extending the XBL binding "%S" with "%S" would lead to it extending itself
+# LOCALIZATION NOTE: do not localize <handler command="…">
+CommandNotInChrome=Use of <handler command="…"> not allowed outside chrome.
+MalformedXBL = An XBL file is malformed. Did you forget the XBL namespace on the bindings tag?
+InvalidExtendsBinding=Extending "%S" is invalid. In general, do not extend tag names.
+MissingIdAttr = An "id" attribute missing on the binding tag.