diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index 1698a34..227c62f 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -171,6 +171,12 @@
       --menu-icon-opacity: var(--dark-menu-icon-opacity);
     }
   }
+  /*= Firefox View Border #498 =================================================*/
+  :root:not([privatebrowsingmode="temporary"])[firefoxviewhidden] #firefox-view-button + #tabbrowser-tabs {
+    border-inline-start: none !important;
+    padding-inline-start: var(--tab-overflow-pinned-tabs-width) !important;
+    margin-inline-start: 0 !important;
+  }
 }
 /*= OS - Compatibility =======================================================*/
 @supports -moz-bool-pref("userChrome.compatibility.os") {
diff --git a/src/compatibility/_theme.scss b/src/compatibility/_theme.scss
index 219edf0..4353cf7 100644
--- a/src/compatibility/_theme.scss
+++ b/src/compatibility/_theme.scss
@@ -170,3 +170,10 @@ vbox[part="drop-indicator-bar"] > image[part="drop-indicator"] {
     }
   }
 }
+
+/*= Firefox View Border #498 =================================================*/
+:root:not([privatebrowsingmode=temporary])[firefoxviewhidden] #firefox-view-button + #tabbrowser-tabs {
+  border-inline-start: none !important;
+  padding-inline-start: var(--tab-overflow-pinned-tabs-width) !important;
+  margin-inline-start: 0 !important;
+}