Update userChrome.css - empty tab improvements

Author: sameerasw

userChrome.css

@@ -280,7 +280,7 @@ findbar {
 }
 
 /* hide compact sidebar when no tabs open */
-#zen-main-app-wrapper[zen-compact-mode="true"]:not(:has(#urlbar[open][zen-floating-urlbar="true"])) #browser:has([zen-empty-tab="true"][selected="true"])  #navigator-toolbox{
+#zen-main-app-wrapper[zen-compact-mode="true"]:not(:has(#urlbar[open][zen-floating-urlbar="true"])) #browser:has([zen-empty-tab="true"][selected="true"])  #navigator-toolbox,#zen-main-app-wrapper[zen-compact-mode="true"] #browser:has([zen-empty-tab="true"][selected="true"]) #urlbar:not([open]){
   opacity: 0 !important;
 }