--- a/browser/app/profile/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/install.rdf.in
+++ b/browser/app/profile/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/install.rdf.in
@@ -8,18 +8,18 @@
 
 <RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:em="http://www.mozilla.org/2004/em-rdf#">
 
   <Description about="urn:mozilla:install-manifest">
     <em:id>{972ce4c6-7e08-4474-a285-3208198ce6fd}</em:id>
     <em:version>@FIREFOX_VERSION@</em:version>
 
-    <!-- Target Application this theme can install into, 
-        with minimum and maximum supported versions. --> 
+    <!-- Target Application this theme can install into,
+        with minimum and maximum supported versions. -->
     <em:targetApplication>
       <Description>
         <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
         <em:minVersion>@FIREFOX_VERSION@</em:minVersion>
         <em:maxVersion>@FIREFOX_VERSION@</em:maxVersion>
       </Description>
     </em:targetApplication>
 
@@ -30,11 +30,13 @@
     <!-- Front End Integration Hooks (used by Theme Manager)-->
     <em:creator>Mozilla</em:creator>
     <em:contributor>Mozilla Contributors</em:contributor>
 
     <!-- Allow lightweight themes to apply to this theme -->
     <em:skinnable>true</em:skinnable>
 
     <em:internalName>classic/1.0</em:internalName>
-  </Description>      
+
+    <em:iconURL>chrome://browser/content/default-theme-icon.svg</em:iconURL>
+  </Description>
 
 </RDF>

new file mode 100644
--- /dev/null
+++ b/browser/base/content/default-theme-icon.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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/. -->
+<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32">
+    <rect fill="#fff" x="1" y="1" width="30" height="30" rx="2" ry="2"/>
+    <path fill="#e3e3e3" d="M3 1h26a2 2 0 0 1 2 2v18H1V3a2 2 0 0 1 2-2z"/>
+    <rect stroke="gray" fill="#fff" x="10.5" y="5.5" width="18" height="11" rx="1" ry="1"/>
+    <circle fill="#fcfcfc" stroke="gray" stroke-width="1.2px" cx="11" cy="11" r="7.5"/>
+    <path fill="#595959" d="M14 10h-3.6l1.3-1.3a1 1 0 0 0-1.4-1.4l-3 3a1 1 0 0 0 0 1.4l3 3a1 1 0 0 0 1.4-1.4L10.4 12H14a1 1 0 0 0 0-2z"/>
+    <path fill="none" stroke="#999" d="M1.5 20.5h29"/>
+    <rect fill="none" stroke="#999" stroke-width="2" x="1" y="1" width="30" height="30" rx="2" ry="2"/>
+</svg>

--- a/browser/base/jar.mn
+++ b/browser/base/jar.mn
@@ -89,16 +89,17 @@ browser.jar:
 #else
         content/browser/browser-tabsintitlebar.js       (content/browser-tabsintitlebar-stub.js)
 #endif
         content/browser/browser-thumbnails.js         (content/browser-thumbnails.js)
         content/browser/browser-trackingprotection.js (content/browser-trackingprotection.js)
         content/browser/tab-content.js                (content/tab-content.js)
         content/browser/content.js                    (content/content.js)
         content/browser/social-content.js             (content/social-content.js)
+        content/browser/default-theme-icon.svg        (content/default-theme-icon.svg)
         content/browser/defaultthemes/1.footer.jpg    (content/defaultthemes/1.footer.jpg)
         content/browser/defaultthemes/1.header.jpg    (content/defaultthemes/1.header.jpg)
         content/browser/defaultthemes/1.icon.jpg      (content/defaultthemes/1.icon.jpg)
         content/browser/defaultthemes/1.preview.jpg   (content/defaultthemes/1.preview.jpg)
         content/browser/defaultthemes/2.footer.jpg    (content/defaultthemes/2.footer.jpg)
         content/browser/defaultthemes/2.header.jpg    (content/defaultthemes/2.header.jpg)
         content/browser/defaultthemes/2.icon.jpg      (content/defaultthemes/2.icon.jpg)
         content/browser/defaultthemes/2.preview.jpg   (content/defaultthemes/2.preview.jpg)

--- a/browser/installer/allowed-dupes.mn
+++ b/browser/installer/allowed-dupes.mn
@@ -19,17 +19,16 @@ browser/chrome/browser/content/browser/d
 browser/chrome/browser/content/browser/defaultthemes/5.header.png
 browser/chrome/browser/content/browser/extension.svg
 browser/chrome/browser/content/browser/places/bookmarkProperties.xul
 browser/chrome/browser/content/browser/places/bookmarkProperties2.xul
 browser/chrome/browser/skin/classic/browser/addons/addon-install-confirm.svg
 browser/chrome/browser/skin/classic/browser/connection-secure.svg
 browser/chrome/browser/skin/classic/browser/controlcenter/warning-gray.svg
 browser/chrome/browser/skin/classic/browser/newtab/close.png
-browser/chrome/browser/skin/classic/browser/theme-switcher-icon.png
 # devtools reduction is bug 1311178
 browser/chrome/devtools/content/dom/content/dom-view.css
 browser/chrome/devtools/content/dom/dom.html
 browser/chrome/devtools/content/dom/main.js
 browser/chrome/devtools/content/framework/toolbox-options.js
 browser/chrome/devtools/content/inspector/fonts/fonts.js
 browser/chrome/devtools/content/inspector/inspector.xhtml
 browser/chrome/devtools/content/memory/initializer.js

--- a/browser/installer/package-manifest.in
+++ b/browser/installer/package-manifest.in
@@ -587,17 +587,16 @@
 
 ; [Browser Chrome Files]
 @RESPATH@/browser/chrome.manifest
 @RESPATH@/browser/chrome/browser@JAREXT@
 @RESPATH@/browser/chrome/browser.manifest
 @RESPATH@/browser/chrome/pdfjs.manifest
 @RESPATH@/browser/chrome/pdfjs/*
 @RESPATH@/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/chrome.manifest
-@RESPATH@/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/icon.png
 @RESPATH@/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/install.rdf
 @RESPATH@/chrome/toolkit@JAREXT@
 @RESPATH@/chrome/toolkit.manifest
 @RESPATH@/chrome/recording.manifest
 @RESPATH@/chrome/recording/*
 #ifdef MOZ_GTK
 @RESPATH@/browser/chrome/icons/default/default16.png
 @RESPATH@/browser/chrome/icons/default/default32.png

--- a/browser/themes/moz.build
+++ b/browser/themes/moz.build
@@ -7,10 +7,8 @@
 toolkit = CONFIG['MOZ_WIDGET_TOOLKIT']
 
 if toolkit == 'cocoa':
     DIRS += ['osx']
 elif toolkit in ('gtk2', 'gtk3'):
     DIRS += ['linux']
 else:
     DIRS += ['windows']
-
-FINAL_TARGET_FILES.extensions['{972ce4c6-7e08-4474-a285-3208198ce6fd}'] += ['shared/icon.png']

--- a/browser/themes/osx/browser.css
+++ b/browser/themes/osx/browser.css
@@ -3264,20 +3264,16 @@ menulist.translate-infobar-element > .me
   .customization-tipPanel-contentImage:-moz-locale-dir(rtl) {
     list-style-image: url(chrome://browser/skin/customizableui/customize-illustration-rtl@2x.png);
   }
 
   #customization-tipPanel > .panel-arrowcontainer > .panel-arrowbox > .panel-arrow[side="left"],
   #customization-tipPanel > .panel-arrowcontainer > .panel-arrowbox > .panel-arrow[side="right"] {
     list-style-image: url("chrome://browser/skin/customizableui/panelarrow-customizeTip@2x.png");
   }
-
-  .customization-lwtheme-menu-theme[defaulttheme] {
-    list-style-image: url(chrome://browser/skin/theme-switcher-icon@2x.png);
-  }
 }
 
 /* End customization mode */
 
 .private-browsing-indicator {
   background-image: url("chrome://browser/skin/privatebrowsing-mask.png");
   background-repeat: no-repeat;
   background-size: 100% auto;

--- a/browser/themes/shared/customizableui/customizeMode.inc.css
+++ b/browser/themes/shared/customizableui/customizeMode.inc.css
@@ -189,17 +189,17 @@
   /* Sadly, button.css thinks its margins are perfect for everyone. */
   margin-inline-start: 6px !important;
 }
 
 #customization-lwtheme-button > .box-inherit > .box-inherit > .button-icon {
   width: 20px;
   height: 20px;
   border-radius: 2px;
-  background-image: url("chrome://browser/skin/theme-switcher-icon.png");
+  background-image: url("chrome://browser/content/default-theme-icon.svg");
   background-size: contain;
 }
 
 %ifdef CAN_DRAW_IN_TITLEBAR
 #customization-titlebar-visibility-button {
   list-style-image: url("chrome://browser/skin/customizableui/customize-titleBar-toggle.png");
   -moz-image-region: rect(0, 24px, 24px, 0);
 }
@@ -383,17 +383,17 @@ toolbarpaletteitem[place="toolbar"]:not(
   margin: 0 -5px 5px;
   padding-top: 0;
   padding-inline-end: 5px;
   padding-bottom: 0;
   padding-inline-start: 0;
 }
 
 .customization-lwtheme-menu-theme[defaulttheme] {
-  list-style-image: url(chrome://browser/skin/theme-switcher-icon.png);
+  list-style-image: url(chrome://browser/content/default-theme-icon.svg);
 }
 
 .customization-lwtheme-menu-theme[active="true"],
 .customization-lwtheme-menu-theme:hover {
   background-color: var(--arrowpanel-dimmed);
   border-color: var(--panel-separator-color);
 }
 

deleted file mode 100644
index 891e7afb1055e484669e792432ac1df496aa14ca..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

--- a/browser/themes/shared/jar.inc.mn
+++ b/browser/themes/shared/jar.inc.mn
@@ -104,18 +104,16 @@
   skin/classic/browser/social/gear_clicked.png                 (../shared/social/gear_clicked.png)
   skin/classic/browser/tabbrowser/connecting.png               (../shared/tabbrowser/connecting.png)
   skin/classic/browser/tabbrowser/connecting@2x.png            (../shared/tabbrowser/connecting@2x.png)
   skin/classic/browser/tabbrowser/crashed.svg                  (../shared/tabbrowser/crashed.svg)
   skin/classic/browser/tabbrowser/pendingpaint.png             (../shared/tabbrowser/pendingpaint.png)
   skin/classic/browser/tabbrowser/tab-audio.svg                (../shared/tabbrowser/tab-audio.svg)
   skin/classic/browser/tabbrowser/tab-audio-small.svg          (../shared/tabbrowser/tab-audio-small.svg)
   skin/classic/browser/tabbrowser/tab-overflow-indicator.png   (../shared/tabbrowser/tab-overflow-indicator.png)
-  skin/classic/browser/theme-switcher-icon.png                 (../shared/theme-switcher-icon.png)
-  skin/classic/browser/theme-switcher-icon@2x.png              (../shared/theme-switcher-icon@2x.png)
   skin/classic/browser/toolbarbutton-dropdown-arrow.png        (../shared/toolbarbutton-dropdown-arrow.png)
   skin/classic/browser/translating-16.png                      (../shared/translation/translating-16.png)
   skin/classic/browser/translating-16@2x.png                   (../shared/translation/translating-16@2x.png)
   skin/classic/browser/translation-16.png                      (../shared/translation/translation-16.png)
   skin/classic/browser/translation-16@2x.png                   (../shared/translation/translation-16@2x.png)
   skin/classic/browser/undoCloseTab.png                        (../shared/undoCloseTab.png)
   skin/classic/browser/undoCloseTab@2x.png                     (../shared/undoCloseTab@2x.png)
   skin/classic/browser/update-badge.svg                        (../shared/update-badge.svg)

deleted file mode 100644
index 891e7afb1055e484669e792432ac1df496aa14ca..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

deleted file mode 100644
index 286adfeaad64110999418d055e58ff097ef56c78..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001