diff --git a/mydoc/mydoc_webstorm_text_editor.md b/mydoc/mydoc_webstorm_text_editor.md
index 1b194b9..662824e 100644
--- a/mydoc/mydoc_webstorm_text_editor.md
+++ b/mydoc/mydoc_webstorm_text_editor.md
@@ -16,6 +16,14 @@ If you decide to use WebStorm, here are a few tips on configuring the editor.
 
 By default, WebStorm comes packaged with a lot more functionality than you probably need. You can lighten the editor by removing some of the plugins. Go to **WebStorm > Preferences > Plugins** and clear the check boxes of plugins you don't need.
 
+## Set default tab indent to 3 spaces instead of 4
+
+You can set the way the tab works, and whether it uses spaces or a tab character. For details, see [Code Style. JavaScript](https://www.jetbrains.com/help/webstorm/2016.1/code-style-javascript.html?origin=old_help#d658997e132) in WebStorm's help.
+
+On a Mac, go to **WebStorm | Preferences | Editor | Code Style | Other File Types**. Don't select the "Use tab character" check box. Set **3** for the **Tab size** and **Indent** check boxes. 
+
+On Windows, go to **File | Settings | Editor | Code Style | Other File Types** to access the same menu.
+
 ## Add the Markdown Support plugin
 
 Since you'll be writing in Markdown, having color coding and other support for Markdown is important. Install the Markdown Support plugin by going to **WebStorm > Preferences > Plugins** and clicking **Install JetBrains Plugin**. Search for **Markdown Support**. (I would avoid the Multimarkdown plugin — it seemed to make all my dashes in frontmatter tags extend half way across the page.)
diff --git a/urls.txt b/urls.txt
index 0acd8da..e8e8982 100644
--- a/urls.txt
+++ b/urls.txt
@@ -13,28 +13,28 @@ search: exclude
 
 {% endcomment %}
 
+
 {% for entry in site.data.sidebars.mydoc_sidebar.entries %}
 {% for folder in entry.folders %}
-{% for folderitem in folder.folderitems %} {% if folderitem.type != "frontmatter" %}
+{% for folderitem in folder.folderitems %} {% unless folderitem.type == "frontmatter" or folderitem.external_url %}
 {{folderitem.url | replace: "/", "" }}:
   title: "{{folderitem.title }}"
   url: "{{folderitem.url | prepend: site.baseurl }}"
   link: "<a href='{{folderitem.url | prepend: site.baseurl }}'>{{folderitem.title}}</a>"
-{% endif %}
+{% endunless %}
 {% for subfolders in folderitem.subfolders %}
-{% for subfolderitem in subfolders.subfolderitems%} {% if subfolderitem.type != "frontmatter" %}
+{% for subfolderitem in subfolders.subfolderitems%} {% unless subfolderitem.type == "frontmatter" or subfolderitem.external_url %}
 {{subfolderitem.url | replace: "/" }}:
   title: "{{subfolderitem.title}}"
   url: "{{subfolderitem.url| prepend: site.baseurl }}"
   link: "<a href='{{subfolderitem.url | prepend: site.baseurl }}'>{{subfolderitem.title}}</a>"
-{% endif %}
+{% endunless %}
 {% endfor %}
 {% endfor %}
 {% endfor %}
 {% endfor %}
 {% endfor %}
 
-
 {% comment %}
                      _            _   _
  _ __  _ __ ___   __| |_   _  ___| |_/ |
@@ -44,22 +44,21 @@ search: exclude
 |_|
 {% endcomment %}
 
-
 {% for entry in site.data.sidebars.product1_sidebar.entries %}
 {% for folder in entry.folders %}
-{% for folderitem in folder.folderitems %} {% if folderitem.type != "frontmatter" %}
+{% for folderitem in folder.folderitems %} {% unless folderitem.type == "frontmatter" or folderitem.external_url %}
 {{folderitem.url | replace: "/", "" }}:
   title: "{{folderitem.title }}"
   url: "{{folderitem.url | prepend: site.baseurl }}"
   link: "<a href='{{folderitem.url | prepend: site.baseurl }}'>{{folderitem.title}}</a>"
-{% endif %}
+{% endunless %}
 {% for subfolders in folderitem.subfolders %}
-{% for subfolderitem in subfolders.subfolderitems%} {% if subfolderitem.type != "frontmatter" %}
+{% for subfolderitem in subfolders.subfolderitems%} {% unless subfolderitem.type == "frontmatter" or subfolderitem.external_url %}
 {{subfolderitem.url | replace: "/" }}:
   title: "{{subfolderitem.title}}"
   url: "{{subfolderitem.url| prepend: site.baseurl }}"
   link: "<a href='{{subfolderitem.url | prepend: site.baseurl }}'>{{subfolderitem.title}}</a>"
-{% endif %}
+{% endunless %}
 {% endfor %}
 {% endfor %}
 {% endfor %}
@@ -68,8 +67,6 @@ search: exclude
 
 
 
-
-
 {% comment %}
                      _            _   ____
  _ __  _ __ ___   __| |_   _  ___| |_|___ \
@@ -80,29 +77,27 @@ search: exclude
 
 {% endcomment %}
 
-
 {% for entry in site.data.sidebars.product2_sidebar.entries %}
 {% for folder in entry.folders %}
-{% for folderitem in folder.folderitems %} {% if folderitem.type != "frontmatter" %}
+{% for folderitem in folder.folderitems %} {% unless folderitem.type == "frontmatter" or folderitem.external_url %}
 {{folderitem.url | replace: "/", "" }}:
   title: "{{folderitem.title }}"
   url: "{{folderitem.url | prepend: site.baseurl }}"
   link: "<a href='{{folderitem.url | prepend: site.baseurl }}'>{{folderitem.title}}</a>"
-{% endif %}
+{% endunless %}
 {% for subfolders in folderitem.subfolders %}
-{% for subfolderitem in subfolders.subfolderitems%} {% if subfolderitem.type != "frontmatter" %}
+{% for subfolderitem in subfolders.subfolderitems%} {% unless subfolderitem.type == "frontmatter" or subfolderitem.external_url %}
 {{subfolderitem.url | replace: "/" }}:
   title: "{{subfolderitem.title}}"
   url: "{{subfolderitem.url| prepend: site.baseurl }}"
   link: "<a href='{{subfolderitem.url | prepend: site.baseurl }}'>{{subfolderitem.title}}</a>"
-{% endif %}
+{% endunless %}
 {% endfor %}
 {% endfor %}
 {% endfor %}
 {% endfor %}
 {% endfor %}
 
-
 {% comment %}
  _
 | |_ ___  _ __  _ __   __ ___   __