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diff --git a/browser/branding/nightly/content/about-logo.png b/browser/branding/nightly/content/about-logo.png
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new file mode 100644
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+  <path d="M179.043 19.377a7.41 7.41 0 0 0 4.266-6.948c0-5.189-3.958-8.532-9.939-8.532h-13.721V36h14.161c6.068 0 10.158-3.43 10.158-9.059a7.711 7.711 0 0 0-4.925-7.564zM163.3 7.24h10.027c3.913 0 6.332 2.111 6.332 5.189s-2.11 5.365-6.024 5.365H163.3zm10.467 25.374H163.3V21.18h10.29c4.4 0 6.685 2.331 6.685 5.717 0 3.342-2.551 5.717-6.509 5.717zM191.8 16.738v-4.485h-3.475V36h3.563V22.983c0-5.233 2.286-7.52 6.244-7.52a5.2 5.2 0 0 1 2.9.748l1.495-3.43a7.752 7.752 0 0 0-3.957-.88 6.576 6.576 0 0 0-6.77 4.837zm23.22-4.968a12.192 12.192 0 0 0-12.313 12.357 12.335 12.335 0 1 0 24.67 0 12.2 12.2 0 0 0-12.359-12.357zm0 21.284a8.606 8.606 0 0 1-8.663-8.927 8.69 8.69 0 1 1 17.371 0 8.642 8.642 0 0 1-8.71 8.927zm41.3-2.112l-7.081-18.689h-3.342l-7.256 18.821-5.981-18.821h-3.782L236.657 36h3.518l7.3-18.821 7.3 18.821h3.254l8.224-23.747h-3.738zm22.649-8.663c-3.694-.747-6.553-1.231-6.553-3.693 0-2.2 1.5-3.782 5.146-3.782a7.666 7.666 0 0 1 6.509 3.166l2.99-2.023a11.483 11.483 0 0 0-9.5-4.221c-5.629-.044-8.839 3.21-8.839 6.9 0 4.749 4.353 5.849 8.443 6.64 3.474.7 6.728 1.231 6.728 3.87 0 2.375-1.935 4.133-5.629 4.133a8.77 8.77 0 0 1-7.651-3.87l-3.123 2.112c2.111 3.034 5.5 4.968 10.686 4.968 6.2.044 9.367-3.649 9.367-7.387-.004-4.877-4.489-6.021-8.579-6.813zm23.92-10.509a12.179 12.179 0 0 0-12.4 12.445c0 6.948 4.925 12.268 12.533 12.268a12.2 12.2 0 0 0 11.038-6.024l-3.078-1.8a8.489 8.489 0 0 1-7.96 4.573c-5.013 0-8.488-3.209-9.015-7.739h20.977v-1.631a11.714 11.714 0 0 0-12.095-12.092zm-8.8 10.553a8.821 8.821 0 0 1 8.8-7.344 8 8 0 0 1 8.4 7.344zM329.541 11.9a6.575 6.575 0 0 0-6.772 4.837v-4.484h-3.475V36h3.563V22.983c0-5.233 2.286-7.52 6.244-7.52a5.2 5.2 0 0 1 2.9.748l1.5-3.43a7.754 7.754 0 0 0-3.96-.881z" fill="#fff"/>
+</svg>
diff --git a/browser/branding/nightly/content/about.png b/browser/branding/nightly/content/about.png
new file mode 100644
index 0000000000..29cecfc95b
--- /dev/null
+++ b/browser/branding/nightly/content/about.png
diff --git a/browser/branding/nightly/content/aboutDialog.css b/browser/branding/nightly/content/aboutDialog.css
new file mode 100644
index 0000000000..2dcdd22cfa
--- /dev/null
+++ b/browser/branding/nightly/content/aboutDialog.css
@@ -0,0 +1,46 @@
+/* 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/. */
+
+#aboutDialogContainer {
+  background-color: #20123a;
+  color: #fff;
+  color-scheme: dark;
+}
+
+#clientBox {
+  padding: 10px 0 15px;
+}
+
+#leftBox {
+  background-image: url("chrome://branding/content/about-logo.png");
+  background-repeat: no-repeat;
+  background-size: 192px auto;
+  background-position: center 20%;
+  /* min-width and min-height create room for the logo */
+  min-width: 210px;
+  min-height: 210px;
+  margin-top: 20px;
+  margin-inline-start: 30px;
+}
+
+@media (min-resolution: 2dppx) {
+  #leftBox {
+    background-image: url("chrome://branding/content/about-logo@2x.png");
+  }
+}
+
+.text-link {
+  color: #fff !important;
+  text-decoration: underline;
+}
+
+#rightBox {
+  margin-inline: 30px;
+  padding-top: 64px;
+}
+
+#bottomBox {
+  background-color: hsla(235, 43%, 10%, .5);
+  padding: 15px 10px 15px;
+}
diff --git a/browser/branding/nightly/content/firefox-wordmark.svg b/browser/branding/nightly/content/firefox-wordmark.svg
new file mode 100644
index 0000000000..65270a3cd9
--- /dev/null
+++ b/browser/branding/nightly/content/firefox-wordmark.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="172" height="42"><path fill="context-fill #20123a" d="M.19 2.82h25.72v7H7.57v9.43h18.34v6.9H7.57v15.14H.19zM34.65.13a4.14 4.14 0 0 1 4.27 4.33 4.12 4.12 0 0 1-4.32 4.32 4.09 4.09 0 0 1-4.27-4.22A4.27 4.27 0 0 1 34.65.13zM31 12.83h7.27v28.46H31zm28.35 7.91a5.89 5.89 0 0 0-3.53-1.27c-3 0-4.64 1.9-4.64 6.06v15.76H44V12.83h6.9v4.11a6.79 6.79 0 0 1 6.8-4.37A8.69 8.69 0 0 1 62.53 14zm3 6.48c0-8.17 6.06-15 14.65-15s14.59 6.06 14.59 14.49v3H69.48c.79 3.58 3.58 6 7.85 6a7.62 7.62 0 0 0 7.06-4.21l6.06 3.63c-3 4.43-7.27 6.75-13.33 6.75-9.22-.01-14.75-6.18-14.75-14.66zM69.59 24h15c-.79-3.63-3.74-5.63-7.59-5.63A7.31 7.31 0 0 0 69.59 24zM93.4 12.83h5.11v-1.42c0-7.75 3.27-11 10.44-11h2.53v6.31h-2.06c-3.37 0-4.11 1.16-4.11 4.69v1.42h6.17v6.54h-6v21.92h-7V19.37H93.4zm19.45 14.23a14.56 14.56 0 0 1 14.85-14.81 14.81 14.81 0 1 1 0 29.62c-8.85 0-14.85-6.49-14.85-14.81zm22.65 0a7.8 7.8 0 1 0-15.59 0 7.8 7.8 0 1 0 15.59 0zm16.86-.32l-10.27-13.91h8.53l6.06 8.75 6.22-8.75h8.38l-10.43 13.86 11 14.6h-8.49L156.53 32l-6.59 9.28h-8.48z"/></svg>
+\ No newline at end of file
diff --git a/browser/branding/nightly/content/jar.mn b/browser/branding/nightly/content/jar.mn
new file mode 100644
index 0000000000..d623a6a2b3
--- /dev/null
+++ b/browser/branding/nightly/content/jar.mn
@@ -0,0 +1,21 @@
+# 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/.
+
+browser.jar:
+% content branding %content/branding/ contentaccessible=yes
+  content/branding/about.png
+  content/branding/about-logo.png
+  content/branding/about-logo.svg
+  content/branding/about-logo@2x.png
+  content/branding/about-logo-private.png
+  content/branding/about-logo-private@2x.png
+  content/branding/about-wordmark.svg
+  content/branding/document.ico                  (../document.ico)
+  content/branding/firefox-wordmark.svg
+  content/branding/icon16.png                    (../default16.png)
+  content/branding/icon32.png                    (../default32.png)
+  content/branding/icon48.png                    (../default48.png)
+  content/branding/icon64.png                    (../default64.png)
+  content/branding/icon128.png                   (../default128.png)
+  content/branding/aboutDialog.css
diff --git a/browser/branding/nightly/content/moz.build b/browser/branding/nightly/content/moz.build
new file mode 100644
index 0000000000..d988c0ff9b
--- /dev/null
+++ b/browser/branding/nightly/content/moz.build
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+JAR_MANIFESTS += ["jar.mn"]