Hide container name box unless urlbar is hovered

Fixes #353

chrome/urlbar_info_icons_on_hover.css

@@ -1,7 +1,7 @@
 /* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/urlbar_info_icons_on_hover.css made available under Mozilla Public License v. 2.0
 See the above repository for updates as well as full license text. */
 
-/* Hides info icons (except remote control icon) on the left side of urlbar and shows them when urlbar is hovered. */
+/* Hides info icons (except remote control icon) on the left side of urlbar and shows them when urlbar is hovered. Also hides container name and shows it on hover*/
 
 #urlbar-search-button,
 #tracking-protection-icon-container,
@@ -17,4 +17,5 @@ See the above repository for updates as well as full license text. */
 #urlbar:hover #urlbar-input-container > box,
 #urlbar:hover #identity-box.extensionPage #identity-icon-label{
   max-width: 300px;
-}
+}
+#urlbar:not(:hover) #userContext-label{ display: none }