diff --git a/toolkit/content/widgets/infobar.css b/toolkit/content/widgets/infobar.css
index fa0bb5fca4a669981d5c22fcba137c874dea8241..97fecbb9957dd733107e1bfe2aac90c7dc0a7f78 100644
--- a/toolkit/content/widgets/infobar.css
+++ b/toolkit/content/widgets/infobar.css
@@ -102,3 +102,18 @@ 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;
+  }
+}
