diff --git a/toolkit/locales/en-US/chrome/global/aboutAbout.dtd b/toolkit/locales/en-US/chrome/global/aboutAbout.dtd
deleted file mode 100644
--- a/toolkit/locales/en-US/chrome/global/aboutAbout.dtd
+++ /dev/null
@@ -1,8 +0,0 @@
-<!-- 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/. -->
-
-<!ENTITY aboutAbout.title  "About About">
-<!ENTITY aboutAbout.note   "This is a list of “about” pages for your convenience.<br/>
-                            Some of them might be confusing. Some are for diagnostic purposes only.<br/>
-                            And some are omitted because they require query strings.">