diff --git a/toolkit/content/widgets/infobar.css b/toolkit/content/widgets/infobar.css
index 9b28d3179db134bb14b4c4d840d5f3aac1dc7b3f..5cdd1a379e5a5156d0adeac78b0af300440d84b5 100644
--- a/toolkit/content/widgets/infobar.css
+++ b/toolkit/content/widgets/infobar.css
@@ -96,3 +96,18 @@ strong {
 :host([type=system]) .content {
   margin-inline-start: 0;
 }
+
+/**
+ * Zen Override
+ */
+:host(.infobar) {
+  --info-bar-background-color: transparent !important;
+  margin: 0;
+  border: 0;
+  border-top: 1px solid var(--arrowpanel-border-color);
+
+  &::before {
+    border-start-start-radius: 0px;
+    border-end-start-radius: 0px;
+  }
+}
