diff --git a/toolkit/content/widgets/infobar.css b/toolkit/content/widgets/infobar.css
index 7818f1ef1dcc62e184bd5e3e8d6d936acf77d2ea..4803c07a183e2df70e8fdc9769bb4bb15a73f39b 100644
--- a/toolkit/content/widgets/infobar.css
+++ b/toolkit/content/widgets/infobar.css
@@ -94,3 +94,18 @@ 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;
+  }
+}
