diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index 6b2bfc5..34b67e9 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -4421,7 +4421,11 @@
       .tab-background::before,
     #navigator-toolbox:not([movingtab])
       .tabbrowser-tab[last-visible-tab]:is([visuallyselected], [multiselected], :hover)
-      ~ #tabs-newtab-button::before {
+      ~ #tabs-newtab-button::before,
+    #navigator-toolbox:not([movingtab])
+      .tabbrowser-tab[last-visible-tab]:is([visuallyselected], [multiselected], :hover)
+      ~ #tabbrowser-arrowscrollbox-periphery
+      #tabs-newtab-button::before {
       opacity: 0 !important;
     }
   }
diff --git a/src/tabbar/unselected_tab/_dynamic_separator.scss b/src/tabbar/unselected_tab/_dynamic_separator.scss
index 9633b1b..2ba2299 100644
--- a/src/tabbar/unselected_tab/_dynamic_separator.scss
+++ b/src/tabbar/unselected_tab/_dynamic_separator.scss
@@ -91,7 +91,10 @@
     .tab-background::before,
   #navigator-toolbox:not([movingtab])
     .tabbrowser-tab[last-visible-tab]:is([visuallyselected], [multiselected], :hover)
-    ~ #tabs-newtab-button::before {
+    ~ #tabs-newtab-button::before, /* Legacy - v103 */
+  #navigator-toolbox:not([movingtab])
+    .tabbrowser-tab[last-visible-tab]:is([visuallyselected], [multiselected], :hover)
+    ~ #tabbrowser-arrowscrollbox-periphery #tabs-newtab-button::before {
     opacity: 0 !important;
   }
 }