diff --git a/firefox/userChrome.css b/firefox/userChrome.css
new file mode 100644
index 0000000..6a3207a
--- /dev/null
+++ b/firefox/userChrome.css
@@ -0,0 +1,16 @@
+#tabbrowser-tabs, #tabbrowser-tabs > .tabbrowser-arrowscrollbox {
+  min-height: 0 !important;
+}
+
+#tabbrowser-tabs tab[first-visible-tab="true"][last-visible-tab="true"],
+#tabbrowser-tabs tab[first-visible-tab="true"][last-visible-tab="true"] + toolbarbutton {
+  visibility: collapse;
+}
+
+#tabbrowser-tabs .tabs-newtab-button {
+  visibility: collapse !important;
+}
+
+#tabbrowser-tabs tab {
+  min-height: var(--tab-min-height);
+}