--- a/browser/themes/osx/browser.css
+++ b/browser/themes/osx/browser.css
@@ -756,17 +756,17 @@ html|input.urlbar-input {
 :root:-moz-any([inFullscreen], [tabsintitlebar]) #TabsToolbar:not(:-moz-lwtheme) {
   -moz-appearance: -moz-mac-vibrant-titlebar-dark;
   -moz-font-smoothing-background-color: -moz-mac-vibrant-titlebar-dark;
   background-color: #232323;
   color: hsl(240, 9%, 98%);
   text-shadow: none;
 }
 
-.tabbrowser-tab[visuallyselected=true] {
+.tabbrowser-tab[visuallyselected=true]:not(:-moz-lwtheme) {
   -moz-font-smoothing-background-color: var(--toolbar-bgcolor);
 }
 
 #tabbrowser-tabs {
   -moz-box-align: stretch;
 }
 
 /**

--- a/browser/themes/osx/compacttheme.css
+++ b/browser/themes/osx/compacttheme.css
@@ -8,8 +8,12 @@
 #main-window[tabsintitlebar] #titlebar-content {
   background: var(--chrome-background-color);
 }
 
 #TabsToolbar:-moz-lwtheme-darktext {
   -moz-appearance: -moz-mac-vibrant-titlebar-light;
   -moz-font-smoothing-background-color: -moz-mac-vibrant-titlebar-light;
 }
+
+.tabbrowser-tab[visuallyselected=true] {
+  -moz-font-smoothing-background-color: var(--toolbar-bgcolor);
+}