diff --git a/userChrome.css b/userChrome.css
index 440caee..e56fd44 100644
--- a/userChrome.css
+++ b/userChrome.css
@@ -369,6 +369,20 @@
     opacity: 1 !important;
   }
 
+  /** New tab button - Smaller button *****************************************/
+  #tabs-newtab-button > .toolbarbutton-icon {
+    margin-left: 1px;
+
+    /* Origianl: calc((var(--tab-min-height) - 16px) / 2) = 10px */
+    --toolbarbutton-inner-padding: 6px;
+  }
+  :root[uidensity="compact"] #tabs-newtab-button > .toolbarbutton-icon {
+    --toolbarbutton-inner-padding: 4px; /* Photon: 6px */
+  }
+  :root[uidensity="touch"] #tabs-newtab-button > .toolbarbutton-icon {
+    --toolbarbutton-inner-padding: 9px; /* Photon: 9px */
+  }
+
   /** Clipped tabs - Letters cleary *******************************************/
   #tabbrowser-tabs[closebuttons=activetab] .tab-content:not([pinned]) {
     padding-inline-start: 8px !important;