Bug 999993 - netmonitor shows useless context menu separator. r=vporof

browser/devtools/netmonitor/netmonitor-view.js

@@ -1622,6 +1622,9 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
       !selectedItem.attachment.responseContent ||
       !selectedItem.attachment.responseContent.content.mimeType.contains("image/");
 
+    let separator = $("#request-menu-context-separator");
+    separator.hidden = !selectedItem;
+
     let newTabElement = $("#request-menu-context-newtab");
     newTabElement.hidden = !selectedItem;
   },

browser/devtools/netmonitor/netmonitor.xul

@@ -38,7 +38,7 @@
       <menuitem id="request-menu-context-resend"
                 label="&netmonitorUI.summary.editAndResend;"
                 accesskey="&netmonitorUI.summary.editAndResend.accesskey;"/>
-      <menuseparator/>
+      <menuseparator id="request-menu-context-separator"/>
       <menuitem id="request-menu-context-perf"
                 label="&netmonitorUI.context.perfTools;"
                 accesskey="&netmonitorUI.context.perfTools.accesskey;"/>