1 files changed, 11 insertions, 0 deletions
diff --git a/application/palemoon/themes/linux/browser.css b/application/palemoon/themes/linux/browser.css
index b545b06cb..933067c2b 100644
--- a/application/palemoon/themes/linux/browser.css
+++ b/application/palemoon/themes/linux/browser.css
@@ -1607,6 +1607,17 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
   background-image: linear-gradient(to top, rgba(0,0,0,.3) 1px, rgba(0,0,0,.05) 1px, transparent 50%);
 }
 
+/* When the tab bar is collapsed, show a 1px border in its place. */
+#TabsToolbar[collapsed="true"] {
+  visibility: visible;
+  height: 1px;
+  border-bottom-width: 1px;
+  /* !important here to override border-style: none on the toolbar */
+  border-bottom-style: solid !important;
+  border-bottom-color: ThreeDShadow;
+  overflow: hidden;
+}
+
 .tabbrowser-tab,
 .tabs-newtab-button {
   position: static;