diff --git a/browser/base/content/browser.css b/browser/base/content/browser.css
index 34aa49d0dea4f7f86c9dbbe4eb41078858724ea3..6384202d58faa9ad9dc66edaa91fd4ef36197a12 100644
--- a/browser/base/content/browser.css
+++ b/browser/base/content/browser.css
@@ -138,16 +138,6 @@ tabbrowser {
   visibility: hidden; /* temporary space to keep a tab's close button under the cursor */
 }
 
-.tabs-newtab-button > .toolbarbutton-menu-dropmarker,
-#new-tab-button > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
-/* override drop marker image padding */
-.tabs-newtab-button > .toolbarbutton-icon {
-  margin-inline-end: 0;
-}
-
 .tabbrowser-tab {
   -moz-binding: url("chrome://browser/content/tabbrowser.xml#tabbrowser-tab");
 }
diff --git a/browser/themes/linux/browser.css b/browser/themes/linux/browser.css
index 32f4f8b87b1b5b58c950aca91af6166a8641044a..506fa7fcc61befcaa6370fa2df0d4dc4b0286e4e 100644
--- a/browser/themes/linux/browser.css
+++ b/browser/themes/linux/browser.css
@@ -1055,10 +1055,6 @@ html|span.ac-emphasize-text-url {
   list-style-image: url("chrome://browser/skin/tabbrowser/alltabs-inverted.png");
 }
 
-#alltabs-button > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
 /* All tabs menupopup */
 .alltabs-item > .menu-iconic-left > .menu-iconic-icon {
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.svg");
diff --git a/browser/themes/osx/browser.css b/browser/themes/osx/browser.css
index bd59efb5d0e0dacc539c9f65a8a1bac0b5a5a403..2324af24464f38e9b422d3cff5810c9633ff86e0 100644
--- a/browser/themes/osx/browser.css
+++ b/browser/themes/osx/browser.css
@@ -1786,10 +1786,6 @@ toolbarbutton.chevron > .toolbarbutton-menu-dropmarker {
   }
 }
 
-#alltabs-button > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
 /* All Tabs Menupopup */
 .alltabs-item > .menu-iconic-left > .menu-iconic-icon {
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.svg");
diff --git a/browser/themes/shared/tabs.inc.css b/browser/themes/shared/tabs.inc.css
index a153e456df36b8aeef168b1167c0ac428843c2c3..684cc1a7dfdd8d46d401a9135dc8546938249d4f 100644
--- a/browser/themes/shared/tabs.inc.css
+++ b/browser/themes/shared/tabs.inc.css
@@ -526,6 +526,15 @@
   width: calc(36px + var(--tab-curve-width));
 }
 
+.tabs-newtab-button > .toolbarbutton-menu-dropmarker {
+  display: none;
+}
+
+.tabs-newtab-button > .toolbarbutton-icon {
+  /* override drop marker image padding */
+  margin-inline-end: 0;
+}
+
 @media (min-resolution: 1.1dppx) {
   /* image preloading hack from like lowdpi styles */
   #tabbrowser-tabs::before {
diff --git a/browser/themes/shared/toolbarbuttons.inc.css b/browser/themes/shared/toolbarbuttons.inc.css
index 5ce253064a4c9ed158a9f36d1fe05c0022c2c37b..2fb31bc9a35e548de5b56cecc3b64ff4a4656032 100644
--- a/browser/themes/shared/toolbarbuttons.inc.css
+++ b/browser/themes/shared/toolbarbuttons.inc.css
@@ -61,19 +61,16 @@ toolbar[brighttext] {
 #nav-bar-overflow-button[disabled=true] > .toolbarbutton-icon,
 #PanelUI-menu-button[disabled=true] > .toolbarbutton-badge-stack > .toolbarbutton-icon,
 #main-window:not([customizing]) .toolbarbutton-1[disabled=true] > .toolbarbutton-icon,
-#main-window:not([customizing]) .toolbarbutton-1[disabled=true] > .toolbarbutton-menu-dropmarker,
 #main-window:not([customizing]) .toolbarbutton-1[disabled=true] > .toolbarbutton-menubutton-dropmarker,
 #main-window:not([customizing]) .toolbarbutton-1 > .toolbarbutton-menubutton-button[disabled=true] > .toolbarbutton-icon,
 #main-window:not([customizing]) .toolbarbutton-1[disabled=true] > :-moz-any(.toolbarbutton-menubutton-button, .toolbarbutton-badge-stack) > .toolbarbutton-icon {
   opacity: 0.4;
 }
 
-.toolbarbutton-1 > .toolbarbutton-menu-dropmarker,
 .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
   list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow.png");
 }
 
-toolbar[brighttext] .toolbarbutton-1 > .toolbarbutton-menu-dropmarker,
 toolbar[brighttext] .toolbarbutton-1 > .toolbarbutton-menubutton-dropmarker {
   list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow-inverted.png");
 }
@@ -209,6 +206,8 @@ toolbarbutton.bookmark-item:not(.subviewbutton),
   border-inline-end-style: none;
 }
 
+.bookmark-item > .toolbarbutton-menu-dropmarker,
+#TabsToolbar .toolbarbutton-1 > .toolbarbutton-menu-dropmarker,
 #nav-bar .toolbarbutton-1 > .toolbarbutton-menu-dropmarker {
   display: none;
 }
@@ -464,6 +463,3 @@ toolbarbutton.bookmark-item:not(.subviewbutton) {
   margin-inline-end: 5px;
 }
 
-.bookmark-item > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
diff --git a/browser/themes/windows/browser.css b/browser/themes/windows/browser.css
index 6d16792de54d1a571f41de3f451bdd7121fa6723..69fd15480e7db4c049bec3cb3240631a888e909f 100644
--- a/browser/themes/windows/browser.css
+++ b/browser/themes/windows/browser.css
@@ -1505,10 +1505,6 @@ treechildren.searchbar-treebody::-moz-tree-row(selected) {
   list-style-image: url("chrome://browser/skin/toolbarbutton-dropdown-arrow-inverted.png");
 }
 
-#alltabs-button > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
 /* All tabs menupopup */
 .alltabs-item > .menu-iconic-left > .menu-iconic-icon {
   list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.svg");