1 files changed, 35 insertions, 0 deletions
diff --git a/toolkit/components/aboutmemory/content/aboutMemory.xhtml b/toolkit/components/aboutmemory/content/aboutMemory.xhtml
new file mode 100644
index 0000000000..999f0b449a
--- /dev/null
+++ b/toolkit/components/aboutmemory/content/aboutMemory.xhtml
@@ -0,0 +1,35 @@
+<?xml version="1.0"?>
+
+<!-- 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/. -->
+
+<!-- We explicitly set the language to English, which more-or-less guarantees
+     that the box-drawing characters used are the correct width. Without that,
+     in a Japanese or Chinese locale we might end up with box-drawing
+     characters that are twice the width of English characters, which messes up
+     the tree layout. See bug 1561153 for details. Note that about:memory is
+     not localized, so setting it explicitly to English should be fine.
+
+     We also set the fonts in aboutMemory.css in such a way that maximizes the
+     chances that the font chosen supports the box-drawing chars.
+-->
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
+  <head>
+    <meta
+      http-equiv="Content-Security-Policy"
+      content="default-src chrome:; object-src 'none'"
+    />
+    <meta name="viewport" content="width=device-width" />
+    <meta name="color-scheme" content="light dark" />
+    <title>Memory Analyzer</title>
+    <link
+      rel="stylesheet"
+      href="chrome://global/skin/aboutMemory.css"
+      type="text/css"
+    />
+    <script src="chrome://global/content/aboutMemory.js" />
+  </head>
+
+  <body></body>
+</html>