diff --git a/browser/components/newtab/content-src/components/CustomizeMenu/_CustomizeMenu.scss b/browser/components/newtab/content-src/components/CustomizeMenu/_CustomizeMenu.scss
index 0a807f13ff14..b524834421dc 100644
--- a/browser/components/newtab/content-src/components/CustomizeMenu/_CustomizeMenu.scss
+++ b/browser/components/newtab/content-src/components/CustomizeMenu/_CustomizeMenu.scss
@@ -182,7 +182,7 @@
       margin-bottom: 2px;
       -moz-context-properties: fill;
       fill: var(--customize-menu-primary-text-color);
-      background: url('#{$image-path}glyph-arrowhead-down-12.svg') right no-repeat;
+      background: url('chrome://global/skin/icons/arrow-down-12.svg') right no-repeat;
       background-size: 8px;
       background-origin: content-box;
       background-color: var(--customize-menu-background);
diff --git a/browser/components/newtab/content-src/styles/_icons.scss b/browser/components/newtab/content-src/styles/_icons.scss
index a78db669fad7..33f6671dc56c 100644
--- a/browser/components/newtab/content-src/styles/_icons.scss
+++ b/browser/components/newtab/content-src/styles/_icons.scss
@@ -167,14 +167,14 @@
   }
 
   &.icon-arrowhead-down-small {
-    background-image: url('chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg');
+    background-image: url('chrome://global/skin/icons/arrow-down-12.svg');
     background-size: $smaller-icon-size;
     height: $smaller-icon-size;
     width: $smaller-icon-size;
   }
 
   &.icon-arrowhead-forward-small {
-    background-image: url('chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg');
+    background-image: url('chrome://global/skin/icons/arrow-down-12.svg');
     background-size: $smaller-icon-size;
     height: $smaller-icon-size;
     transform: rotate(-90deg);
diff --git a/browser/components/newtab/css/activity-stream-linux.css b/browser/components/newtab/css/activity-stream-linux.css
index dd8766462c8c..f2e72bebf4c5 100644
--- a/browser/components/newtab/css/activity-stream-linux.css
+++ b/browser/components/newtab/css/activity-stream-linux.css
@@ -334,13 +334,13 @@ body[lwt-newtab-brighttext] {
   background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-16.svg");
 }
 .icon.icon-arrowhead-down-small {
-  background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-size: 12px;
   height: 12px;
   width: 12px;
 }
 .icon.icon-arrowhead-forward-small {
-  background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-size: 12px;
   height: 12px;
   transform: rotate(-90deg);
@@ -2163,7 +2163,7 @@ main.has-snippet {
   margin-bottom: 2px;
   -moz-context-properties: fill;
   fill: var(--customize-menu-primary-text-color);
-  background: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg") right no-repeat;
+  background: url("chrome://global/skin/icons/arrow-down-12.svg") right no-repeat;
   background-size: 8px;
   background-origin: content-box;
   background-color: var(--customize-menu-background);
diff --git a/browser/components/newtab/css/activity-stream-mac.css b/browser/components/newtab/css/activity-stream-mac.css
index 1ef4961ff4e5..1a9d27bef172 100644
--- a/browser/components/newtab/css/activity-stream-mac.css
+++ b/browser/components/newtab/css/activity-stream-mac.css
@@ -338,13 +338,13 @@ body[lwt-newtab-brighttext] {
   background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-16.svg");
 }
 .icon.icon-arrowhead-down-small {
-  background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-size: 12px;
   height: 12px;
   width: 12px;
 }
 .icon.icon-arrowhead-forward-small {
-  background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-size: 12px;
   height: 12px;
   transform: rotate(-90deg);
@@ -2167,7 +2167,7 @@ main.has-snippet {
   margin-bottom: 2px;
   -moz-context-properties: fill;
   fill: var(--customize-menu-primary-text-color);
-  background: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg") right no-repeat;
+  background: url("chrome://global/skin/icons/arrow-down-12.svg") right no-repeat;
   background-size: 8px;
   background-origin: content-box;
   background-color: var(--customize-menu-background);
diff --git a/browser/components/newtab/css/activity-stream-windows.css b/browser/components/newtab/css/activity-stream-windows.css
index a508d1550888..4120f336aead 100644
--- a/browser/components/newtab/css/activity-stream-windows.css
+++ b/browser/components/newtab/css/activity-stream-windows.css
@@ -334,13 +334,13 @@ body[lwt-newtab-brighttext] {
   background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-16.svg");
 }
 .icon.icon-arrowhead-down-small {
-  background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-size: 12px;
   height: 12px;
   width: 12px;
 }
 .icon.icon-arrowhead-forward-small {
-  background-image: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-size: 12px;
   height: 12px;
   transform: rotate(-90deg);
@@ -2163,7 +2163,7 @@ main.has-snippet {
   margin-bottom: 2px;
   -moz-context-properties: fill;
   fill: var(--customize-menu-primary-text-color);
-  background: url("chrome://activity-stream/content/data/content/assets/glyph-arrowhead-down-12.svg") right no-repeat;
+  background: url("chrome://global/skin/icons/arrow-down-12.svg") right no-repeat;
   background-size: 8px;
   background-origin: content-box;
   background-color: var(--customize-menu-background);
diff --git a/browser/installer/allowed-dupes.mn b/browser/installer/allowed-dupes.mn
index 854e62ff6740..dc50f9e1d950 100644
--- a/browser/installer/allowed-dupes.mn
+++ b/browser/installer/allowed-dupes.mn
@@ -102,8 +102,6 @@ browser/chrome/browser/content/activity-stream/data/content/tippytop/favicons/ya
 browser/chrome/browser/search-extensions/yandex/yandex-ru.ico
 
 # Bug 1698146, bug 1699586 - Deduplicate chevrons/arrows in the tree
-chrome/toolkit/skin/classic/global/icons/arrow-dropdown-12.svg
-chrome/toolkit/skin/classic/global/icons/twisty-expanded.svg
 chrome/toolkit/skin/classic/global/icons/twisty-collapsed-rtl.svg
 chrome/toolkit/skin/classic/global/icons/arrow-dropdown-16.svg
 chrome/toolkit/skin/classic/global/icons/find-next-arrow.svg
@@ -124,7 +122,6 @@ chrome/toolkit/skin/classic/global/icons/lightbulb.svg
 
 # Bug 1708502 - De-duplicate about:newtab icons
 browser/chrome/browser/content/activity-stream/data/content/assets/glyph-arrow.svg
-browser/chrome/browser/content/activity-stream/data/content/assets/glyph-arrowhead-down-12.svg
 browser/chrome/browser/content/activity-stream/data/content/assets/glyph-arrowhead-down-16.svg
 browser/chrome/browser/content/activity-stream/data/content/assets/glyph-caret-right.svg
 browser/chrome/browser/content/activity-stream/data/content/assets/glyph-dismiss-16.svg
diff --git a/browser/themes/linux/places/organizer.css b/browser/themes/linux/places/organizer.css
index ef17fc32d1ff..97ee94ecad7b 100644
--- a/browser/themes/linux/places/organizer.css
+++ b/browser/themes/linux/places/organizer.css
@@ -80,7 +80,7 @@
   display: -moz-box;
   width: 12px;
   height: 12px;
-  content: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  content: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill;
   fill: currentColor;
 }
diff --git a/browser/themes/osx/places/organizer.css b/browser/themes/osx/places/organizer.css
index dbf48d11faea..808a082c5fe1 100644
--- a/browser/themes/osx/places/organizer.css
+++ b/browser/themes/osx/places/organizer.css
@@ -73,7 +73,7 @@
 }
 
 #placesToolbar > toolbarbutton[type="menu"] > .toolbarbutton-menu-dropmarker {
-  list-style-image: url(chrome://global/skin/icons/arrow-dropdown-12.svg);
+  list-style-image: url(chrome://global/skin/icons/arrow-down-12.svg);
   padding: 0;
   margin-inline-end: 2px;
 }
diff --git a/browser/themes/shared/browser.inc.css b/browser/themes/shared/browser.inc.css
index 4705cd281705..568aba87c01f 100644
--- a/browser/themes/shared/browser.inc.css
+++ b/browser/themes/shared/browser.inc.css
@@ -712,7 +712,7 @@ menupopup::part(drop-indicator) {
 }
 
 .ac-dropmarker::part(icon) {
-  list-style-image: url(chrome://global/skin/icons/arrow-dropdown-12.svg);
+  list-style-image: url(chrome://global/skin/icons/arrow-down-12.svg);
   -moz-context-properties: fill;
   fill: var(--input-color, -moz-DialogText);
 }
diff --git a/browser/themes/shared/customizableui/panelUI.inc.css b/browser/themes/shared/customizableui/panelUI.inc.css
index 74486701df32..bc138624ea1d 100644
--- a/browser/themes/shared/customizableui/panelUI.inc.css
+++ b/browser/themes/shared/customizableui/panelUI.inc.css
@@ -2726,7 +2726,7 @@ panelview:not([mainview]) #PanelUI-whatsNew-title {
   margin-block-start: 5px;
   -moz-context-properties: fill;
   fill: currentColor;
-  background: url("chrome://global/skin/icons/arrow-dropdown-12.svg") center center no-repeat;
+  background: url("chrome://global/skin/icons/arrow-down-12.svg") center center no-repeat;
 }
 
 #PanelUI-profiler-presets:-moz-locale-dir(ltr)::after {
diff --git a/browser/themes/shared/places/sidebar.inc.css b/browser/themes/shared/places/sidebar.inc.css
index 5b3c52e11dcb..2aa8fdf972f3 100644
--- a/browser/themes/shared/places/sidebar.inc.css
+++ b/browser/themes/shared/places/sidebar.inc.css
@@ -73,7 +73,7 @@
 #viewButton > .button-box > .button-menu-dropmarker {
   appearance: none !important;
   display: -moz-box;
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   width: 12px;
   height: 12px;
   -moz-context-properties: fill;
diff --git a/browser/themes/shared/preferences/privacy.css b/browser/themes/shared/preferences/privacy.css
index 16afc6f97645..b55c242b4c05 100644
--- a/browser/themes/shared/preferences/privacy.css
+++ b/browser/themes/shared/preferences/privacy.css
@@ -139,7 +139,7 @@
   min-width: 20px;
   max-height: 20px;
   max-width: 20px;
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-color: transparent;
   padding: 3px;
 }
diff --git a/browser/themes/shared/sidebar.inc.css b/browser/themes/shared/sidebar.inc.css
index 70210ce4aa88..a2108e833c65 100644
--- a/browser/themes/shared/sidebar.inc.css
+++ b/browser/themes/shared/sidebar.inc.css
@@ -64,7 +64,7 @@
 }
 
 #sidebar-switcher-arrow {
-  list-style-image: url(chrome://global/skin/icons/arrow-dropdown-12.svg);
+  list-style-image: url(chrome://global/skin/icons/arrow-down-12.svg);
   width: 12px;
   height: 12px;
 }
diff --git a/browser/themes/shared/syncedtabs/sidebar.inc.css b/browser/themes/shared/syncedtabs/sidebar.inc.css
index adaa65bb4b81..38468dcb2b05 100644
--- a/browser/themes/shared/syncedtabs/sidebar.inc.css
+++ b/browser/themes/shared/syncedtabs/sidebar.inc.css
@@ -84,7 +84,7 @@ body {
 .item.client .item-twisty-container {
   min-width: 12px;
   height: 12px;
-  background-image: url("chrome://global/skin/icons/twisty-expanded.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill, fill-opacity;
   fill: currentColor;
   fill-opacity: 1;
diff --git a/browser/themes/shared/translation/infobar.inc.css b/browser/themes/shared/translation/infobar.inc.css
index 47df3174c01f..6762de16622d 100644
--- a/browser/themes/shared/translation/infobar.inc.css
+++ b/browser/themes/shared/translation/infobar.inc.css
@@ -38,7 +38,7 @@ notification[value="translation"] menulist::part(dropmarker) {
 }
 
 notification[value="translation"] menulist::part(dropmarker-icon) {
-  list-style-image: url(chrome://global/skin/icons/arrow-dropdown-12.svg);
+  list-style-image: url(chrome://global/skin/icons/arrow-down-12.svg);
   -moz-context-properties: fill;
   fill: currentColor;
 }
diff --git a/browser/themes/shared/urlbar-searchbar.inc.css b/browser/themes/shared/urlbar-searchbar.inc.css
index 3919e1f569cd..ad63061e0fa0 100644
--- a/browser/themes/shared/urlbar-searchbar.inc.css
+++ b/browser/themes/shared/urlbar-searchbar.inc.css
@@ -843,7 +843,7 @@
 }
 
 .searchbar-search-button:hover:not([addengines=true]) > .searchbar-search-icon-overlay {
-  list-style-image: url(chrome://global/skin/icons/arrow-dropdown-12.svg);
+  list-style-image: url(chrome://global/skin/icons/arrow-down-12.svg);
   -moz-context-properties: fill;
   margin-inline: -8px 2px;
   width: 6px;
diff --git a/browser/themes/windows/places/organizer.css b/browser/themes/windows/places/organizer.css
index a3439c24016a..44488d298d30 100644
--- a/browser/themes/windows/places/organizer.css
+++ b/browser/themes/windows/places/organizer.css
@@ -145,7 +145,7 @@
 #placesMenu > menu > .menubar-text {
   margin-block: 0 !important; /* override menu.css */
   padding-inline-end: 8px;
-  background: url(chrome://global/skin/icons/arrow-dropdown-12.svg) right center no-repeat;
+  background: url(chrome://global/skin/icons/arrow-down-12.svg) right center no-repeat;
   background-size: 6px;
 }
 
@@ -313,7 +313,7 @@ treechildren::-moz-tree-separator(selected) {
   border-radius: 4px;
   color: var(--organizer-color);
   background-color: var(--organizer-content-background);
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill;
   fill: currentColor;
 }
@@ -337,7 +337,7 @@ treechildren::-moz-tree-separator(selected) {
 }
 
 #editBookmarkPanelRows .expander-up {
-  transform: scaleY(-1);
+  list-style-image: url("chrome://global/skin/icons/arrow-up-12.svg");
 }
 
 #editBookmarkPanelRows .expander-up > .button-box,
diff --git a/toolkit/components/aboutperformance/content/aboutPerformance.css b/toolkit/components/aboutperformance/content/aboutPerformance.css
index 62085a9f8c06..cea618255dd3 100644
--- a/toolkit/components/aboutperformance/content/aboutPerformance.css
+++ b/toolkit/components/aboutperformance/content/aboutPerformance.css
@@ -159,7 +159,7 @@ td {
   transform: scaleX(-1);
 }
 .twisty.open::before {
-  content: url("chrome://global/skin/icons/twisty-expanded.svg");
+  content: url("chrome://global/skin/icons/arrow-down-12.svg");
 }
 #dispatch-tbody > tr > td.indent {
   padding-inline-start: 88px;
@@ -201,7 +201,7 @@ td {
   fill: currentColor;
 }
 .desc {
-  background-image: url(chrome://global/skin/icons/arrow-dropdown-12.svg);
+  background-image: url(chrome://global/skin/icons/arrow-down-12.svg);
   -moz-context-properties: fill;
   fill: currentColor;
 }
diff --git a/toolkit/components/aboutprocesses/content/aboutProcesses.css b/toolkit/components/aboutprocesses/content/aboutProcesses.css
index d1a8de4ab9da..5b8030e4b82e 100644
--- a/toolkit/components/aboutprocesses/content/aboutProcesses.css
+++ b/toolkit/components/aboutprocesses/content/aboutProcesses.css
@@ -106,7 +106,7 @@ td:first-child {
   content: url("chrome://global/skin/icons/twisty-collapsed-rtl.svg");
 }
 .twisty.open::before {
-  content: url("chrome://global/skin/icons/twisty-expanded.svg");
+  content: url("chrome://global/skin/icons/arrow-down-12.svg");
 }
 .indent {
   padding-inline: 48px 0;
@@ -156,11 +156,11 @@ tr[selected] > td {
   background-image: url(chrome://global/skin/icons/arrow-up-12.svg);
 }
 .desc {
-  background-image: url(chrome://global/skin/icons/arrow-dropdown-12.svg);
+  background-image: url(chrome://global/skin/icons/arrow-down-12.svg);
 }
 %else
 .asc {
-  background-image: url(chrome://global/skin/icons/arrow-dropdown-12.svg);
+  background-image: url(chrome://global/skin/icons/arrow-down-12.svg);
 }
 .desc {
   background-image: url(chrome://global/skin/icons/arrow-up-12.svg);
diff --git a/toolkit/components/printing/content/print.css b/toolkit/components/printing/content/print.css
index 8b51f828e588..d99da399e67c 100644
--- a/toolkit/components/printing/content/print.css
+++ b/toolkit/components/printing/content/print.css
@@ -108,7 +108,7 @@ select:not([size], [multiple])[iconic] {
 
 #printer-picker {
   background-size: auto 12px, 16px;
-  background-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg"), url("chrome://global/skin/icons/print.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg"), url("chrome://global/skin/icons/print.svg");
   background-position: right 3px center, left 8px center;
   width: 100%;
 }
@@ -118,7 +118,7 @@ select:not([size], [multiple])[iconic] {
 }
 
 #printer-picker[output="pdf"] {
-  background-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg"), url("chrome://global/skin/icons/page-portrait.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg"), url("chrome://global/skin/icons/page-portrait.svg");
 }
 
 input[type="number"],
@@ -151,14 +151,13 @@ input[type="text"] {
 }
 
 #more-settings > summary > .twisty {
-  background-image: url("chrome://global/skin/icons/twisty-expanded.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-repeat: no-repeat;
   background-position: center;
   -moz-context-properties: fill;
   fill: currentColor;
   width: 12px;
   height: 12px;
-  scale: 1 1;
 }
 
 #more-settings > summary > .label {
@@ -166,8 +165,7 @@ input[type="text"] {
 }
 
 #more-settings[open] > summary > .twisty {
-  /* flip arrow to point up for the open state */
-  scale: 1 -1;
+  background-image: url("chrome://global/skin/icons/arrow-up-12.svg");
 }
 
 #open-dialog-link {
diff --git a/toolkit/themes/linux/global/button.css b/toolkit/themes/linux/global/button.css
index 8ba408a5a478..edf9ca457203 100644
--- a/toolkit/themes/linux/global/button.css
+++ b/toolkit/themes/linux/global/button.css
@@ -70,5 +70,5 @@ button[type="disclosure"] {
 }
 
 button[type="disclosure"][open="true"] {
-  list-style-image: url("chrome://global/skin/icons/twisty-expanded.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
 }
diff --git a/toolkit/themes/linux/global/toolbarbutton.css b/toolkit/themes/linux/global/toolbarbutton.css
index a29aad0271e1..cb3ea05c7035 100644
--- a/toolkit/themes/linux/global/toolbarbutton.css
+++ b/toolkit/themes/linux/global/toolbarbutton.css
@@ -60,7 +60,7 @@ toolbarbutton:-moz-lwtheme:not(:hover, [checked="true"], [open="true"], [disable
 
 .toolbarbutton-combined-buttons-dropmarker {
   appearance: none;
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill;
   fill: currentColor;
   width: auto;
diff --git a/toolkit/themes/osx/global/toolbarbutton.css b/toolkit/themes/osx/global/toolbarbutton.css
index b0a403331622..318655d18d5b 100644
--- a/toolkit/themes/osx/global/toolbarbutton.css
+++ b/toolkit/themes/osx/global/toolbarbutton.css
@@ -26,7 +26,7 @@ toolbarbutton[disabled="true"] {
 .toolbarbutton-menu-dropmarker,
 .toolbarbutton-combined-buttons-dropmarker {
   appearance: none;
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill;
   fill: currentColor;
   width: auto;
diff --git a/toolkit/themes/shared/arrowscrollbox.css b/toolkit/themes/shared/arrowscrollbox.css
index ebd620496724..842c443167fc 100644
--- a/toolkit/themes/shared/arrowscrollbox.css
+++ b/toolkit/themes/shared/arrowscrollbox.css
@@ -14,7 +14,7 @@
 
 toolbarbutton {
   color: inherit !important; /* override any color changes for toolbar buttons in e.g. disabled or hover states */
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill, fill-opacity;
   fill: currentColor;
   fill-opacity: 1;
@@ -30,7 +30,7 @@ toolbarbutton[disabled="true"] {
 }
 
 #scrollbutton-up > .toolbarbutton-icon {
-  transform: scaleY(-1);
+  list-style-image: url("chrome://global/skin/icons/arrow-up-12.svg");
 }
 
 :host([orient="horizontal"]) > #scrollbutton-down:-moz-locale-dir(ltr) > .toolbarbutton-icon,
diff --git a/browser/components/newtab/data/content/assets/glyph-arrowhead-down-12.svg b/toolkit/themes/shared/icons/arrow-down-12.svg
similarity index 100%
rename from browser/components/newtab/data/content/assets/glyph-arrowhead-down-12.svg
rename to toolkit/themes/shared/icons/arrow-down-12.svg
diff --git a/toolkit/themes/shared/icons/arrow-dropdown-12.svg b/toolkit/themes/shared/icons/arrow-dropdown-12.svg
deleted file mode 100644
index 6b9d465bc1c5..000000000000
--- a/toolkit/themes/shared/icons/arrow-dropdown-12.svg
+++ /dev/null
@@ -1,6 +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/. -->
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 12 12" width="12" height="12" fill="context-fill" fill-opacity="context-fill-opacity">
-  <path d="m6.24 8.999 3.614-3.613a.498.498 0 0 0 0-.707.5.5 0 0 0-.707 0L5.999 7.826 2.854 4.68a.5.5 0 0 0-.707.707L5.759 9l.481-.001z"/>
-</svg>
diff --git a/toolkit/themes/shared/icons/twisty-expanded.svg b/toolkit/themes/shared/icons/twisty-expanded.svg
deleted file mode 100644
index 6b9d465bc1c5..000000000000
--- a/toolkit/themes/shared/icons/twisty-expanded.svg
+++ /dev/null
@@ -1,6 +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/. -->
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 12 12" width="12" height="12" fill="context-fill" fill-opacity="context-fill-opacity">
-  <path d="m6.24 8.999 3.614-3.613a.498.498 0 0 0 0-.707.5.5 0 0 0-.707 0L5.999 7.826 2.854 4.68a.5.5 0 0 0-.707.707L5.759 9l.481-.001z"/>
-</svg>
diff --git a/toolkit/themes/shared/in-content/common.inc.css b/toolkit/themes/shared/in-content/common.inc.css
index b28d0f8919bc..2b4a80305128 100644
--- a/toolkit/themes/shared/in-content/common.inc.css
+++ b/toolkit/themes/shared/in-content/common.inc.css
@@ -406,7 +406,7 @@ xul|tab:-moz-focusring > .tab-middle > .tab-text {
 }
 
 html|select:not([size], [multiple]) {
-  background-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  background-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   background-position: right 3px center;
   background-repeat: no-repeat;
   background-size: auto 12px;
@@ -546,7 +546,7 @@ xul|menulist::part(dropmarker) {
   padding: 0;
   border: none;
   background-color: transparent;
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill;
   fill: currentColor;
 }
diff --git a/toolkit/themes/shared/jar.inc.mn b/toolkit/themes/shared/jar.inc.mn
index 77d87f1aa20b..07c6a20b705d 100644
--- a/toolkit/themes/shared/jar.inc.mn
+++ b/toolkit/themes/shared/jar.inc.mn
@@ -77,12 +77,11 @@ toolkit.jar:
   skin/classic/global/icons/sort-arrow.svg                 (../../shared/icons/sort-arrow.svg)
   skin/classic/global/icons/twisty-collapsed.svg           (../../shared/icons/twisty-collapsed.svg)
   skin/classic/global/icons/twisty-collapsed-rtl.svg       (../../shared/icons/twisty-collapsed-rtl.svg)
-  skin/classic/global/icons/twisty-expanded.svg            (../../shared/icons/twisty-expanded.svg)
 #if defined(NIGHTLY_BUILD)
   skin/classic/global/icons/icon-refresh.svg               (../../shared/icons/icon-refresh.svg)
 #endif
   skin/classic/global/icons/update-icon.svg                (../../shared/icons/update-icon.svg)
-  skin/classic/global/icons/arrow-dropdown-12.svg          (../../shared/icons/arrow-dropdown-12.svg)
+  skin/classic/global/icons/arrow-down-12.svg            (../../shared/icons/arrow-down-12.svg)
   skin/classic/global/icons/arrow-dropdown-16.svg          (../../shared/icons/arrow-dropdown-16.svg)
   skin/classic/global/icons/arrow-up-12.svg                (../../shared/icons/arrow-up-12.svg)
   skin/classic/global/icons/arrow-up-16.svg                (../../shared/icons/arrow-up-16.svg)
diff --git a/toolkit/themes/shared/tree.inc.css b/toolkit/themes/shared/tree.inc.css
index 8fda376de56f..742817e2f805 100644
--- a/toolkit/themes/shared/tree.inc.css
+++ b/toolkit/themes/shared/tree.inc.css
@@ -185,7 +185,7 @@ treechildren:-moz-locale-dir(rtl)::-moz-tree-twisty(closed) {
 }
 
 treechildren::-moz-tree-twisty(open) {
-  list-style-image: url("chrome://global/skin/icons/twisty-expanded.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
 }
 
 treechildren::-moz-tree-indentation {
diff --git a/toolkit/themes/windows/global/button.css b/toolkit/themes/windows/global/button.css
index 977d4193655a..283f609dfe8b 100644
--- a/toolkit/themes/windows/global/button.css
+++ b/toolkit/themes/windows/global/button.css
@@ -60,7 +60,7 @@ button:where([disabled="true"]) {
 
 .button-menu-dropmarker {
   appearance: none;
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill;
   fill: currentColor;
   width: 12px;
@@ -84,5 +84,5 @@ button[type="disclosure"] {
 }
 
 button[type="disclosure"][open="true"] {
-  list-style-image: url("chrome://global/skin/icons/twisty-expanded.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
 }
diff --git a/toolkit/themes/windows/global/toolbarbutton.css b/toolkit/themes/windows/global/toolbarbutton.css
index edfbbdcb711a..071cf7eb4905 100644
--- a/toolkit/themes/windows/global/toolbarbutton.css
+++ b/toolkit/themes/windows/global/toolbarbutton.css
@@ -64,7 +64,7 @@ toolbarbutton[disabled="true"] {
 .toolbarbutton-menu-dropmarker,
 .toolbarbutton-combined-buttons-dropmarker {
   appearance: none;
-  list-style-image: url("chrome://global/skin/icons/arrow-dropdown-12.svg");
+  list-style-image: url("chrome://global/skin/icons/arrow-down-12.svg");
   -moz-context-properties: fill;
   fill: currentColor;
   width: auto;