Bug 789007 - Unwanted border between pinned tabs and navigation toolbar when tabstrip overflows. r=ttaubert

browser/themes/gnomestripe/browser.css

@@ -1587,7 +1587,7 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
                     -moz-radial-gradient(center 3px, circle cover, rgba(233,242,252,1) 3%, rgba(172,206,255,.75) 40%, rgba(87,151,201,.5) 80%, rgba(87,151,201,0));
 }
 
-#tabbrowser-tabs[positionpinnedtabs] > .tabbrowser-tab[pinned] {
+#tabbrowser-tabs[positionpinnedtabs] > .tabbrowser-tab > .tab-stack > .tab-content[pinned] {
   min-height: 18px; /* corresponds to the max. height of non-textual tab contents, i.e. the tab close button */
 }