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+<!DOCTYPE html>
+# 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/.
+#
+#filter substitution
+#include @TOPOBJDIR@/source-repo.h
+<html>
+<head>
+  <meta http-equiv="Content-Security-Policy" content="default-src 'none'; style-src chrome:; object-src 'none'" />
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width; user-scalable=false;">
+  <title>Build Configuration</title>
+  <link rel="stylesheet" href="chrome://global/skin/about.css" type="text/css">
+  <link rel="stylesheet" href="chrome://global/content/buildconfig.css" type="text/css">
+</head>
+<body class="aboutPageWideContainer">
+<h1>Build Configuration</h1>
+#ifdef MOZ_SOURCE_URL
+<h2>Source</h2>
+<p>Built from <a href="@MOZ_SOURCE_URL@">@MOZ_SOURCE_URL@</a></p>
+#endif
+<h2>Build platform</h2>
+<table>
+  <tbody>
+    <tr>
+      <th>target</th>
+    </tr>
+    <tr>
+      <td>@target@</td>
+    </tr>
+  </tbody>
+</table>
+#if defined(CC) && defined(CXX) && defined(RUSTC)
+<h2>Build tools</h2>
+<table>
+  <tbody>
+    <tr>
+      <th>Compiler</th>
+      <th>Version</th>
+      <th>Compiler flags</th>
+    </tr>
+    <tr>
+      <td>@CC@</td>
+      <td>@CC_VERSION@</td>
+      <td>@CFLAGS@</td>
+    </tr>
+    <tr>
+      <td>@CXX@</td>
+      <td>@CC_VERSION@</td>
+      <td>@CXXFLAGS@</td>
+    </tr>
+    <tr>
+      <td>@RUSTC@</td>
+      <td>@RUSTC_VERSION@</td>
+      <td>@RUSTFLAGS@</td>
+    </tr>
+  </tbody>
+</table>
+#endif
+<h2>Configure options</h2>
+<p>@MOZ_CONFIGURE_OPTIONS@</p>
+#ifdef ANDROID
+<h2>Package name</h2>
+<p>@ANDROID_PACKAGE_NAME@</p>
+#endif
+</body>
+</html>