1 files changed, 11 insertions, 0 deletions
diff --git a/application/palemoon/themes/osx/browser.css b/application/palemoon/themes/osx/browser.css
index ddf050785..20e8c5eac 100644
--- a/application/palemoon/themes/osx/browser.css
+++ b/application/palemoon/themes/osx/browser.css
@@ -1630,6 +1630,17 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
     background-image: linear-gradient(to top, @toolbarShadowColor@ 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;
+}
+
 @media (-moz-mac-lion-theme) {
     #main-window[sizemode=normal] #TabsToolbar {
         padding-left: 2px;