diff --git a/_includes/image.html b/_includes/image.html
index 7b3b0fa..dea99d9 100644
--- a/_includes/image.html
+++ b/_includes/image.html
@@ -1 +1 @@
-<figure>{% if {{include.url}} %}<a class="no_icon" target="_blank" href="{{include.url}}">{% endif %}<img class="docimage" src="images/{{include.file}}" alt="{{include.alt}}" {% if {{include.max-width}} %}style="max-width: {{include.max-width}}px"{% endif %} />{% if {{include.url}} %}</a>{% endif %}{% if {{include.caption}} %}<figcaption>{{include.caption}}</figcaption>{% endif %}</figure>
+<figure>{% if {{include.url}} %}<a class="no_icon" target="_blank" rel="noopener" href="{{include.url}}">{% endif %}<img class="docimage" src="images/{{include.file}}" alt="{{include.alt}}" {% if {{include.max-width}} %}style="max-width: {{include.max-width}}px"{% endif %} />{% if {{include.url}} %}</a>{% endif %}{% if {{include.caption}} %}<figcaption>{{include.caption}}</figcaption>{% endif %}</figure>
diff --git a/_includes/sidebar.html b/_includes/sidebar.html
index 47a6490..787b1bd 100644
--- a/_includes/sidebar.html
+++ b/_includes/sidebar.html
@@ -11,7 +11,7 @@
           {% for folderitem in folder.folderitems %}
           {% if folderitem.output contains "web" %}
           {% if folderitem.external_url %}
-          <li><a href="{{folderitem.external_url}}" target="_blank">{{folderitem.title}}</a></li>
+          <li><a href="{{folderitem.external_url}}" target="_blank" rel="noopener">{{folderitem.title}}</a></li>
           {% elsif page.url == folderitem.url %}
           <li class="active"><a href="{{folderitem.url | remove: "/"}}">{{folderitem.title}}</a></li>
           {% elsif folderitem.type == "empty" %}
@@ -28,7 +28,7 @@
                   {% for subfolderitem in subfolders.subfolderitems %}
                   {% if subfolderitem.output contains "web" %}
                   {% if subfolderitem.external_url %}
-                  <li><a href="{{subfolderitem.external_url}}" target="_blank">{{subfolderitem.title}}</a></li>
+                  <li><a href="{{subfolderitem.external_url}}" target="_blank" rel="noopener">{{subfolderitem.title}}</a></li>
                   {% elsif page.url == subfolderitem.url %}
                   <li class="active"><a href="{{subfolderitem.url | remove: "/"}}">{{subfolderitem.title}}</a></li>
                   {% else %}
diff --git a/_includes/topnav.html b/_includes/topnav.html
index 5acf50c..a246c29 100644
--- a/_includes/topnav.html
+++ b/_includes/topnav.html
@@ -22,7 +22,7 @@
                 {% for entry in topnav.topnav %}
                 {% for item in entry.items %}
                 {% if item.external_url %}
-                <li><a href="{{item.external_url}}" target="_blank">{{item.title}}</a></li>
+                <li><a href="{{item.external_url}}" target="_blank" rel="noopener">{{item.title}}</a></li>
                 {% elsif page.url contains item.url %}
                 <li class="active"><a href="{{item.url | remove: "/"}}">{{item.title}}</a></li>
                 {% else %}
@@ -39,7 +39,7 @@
                     <ul class="dropdown-menu">
                         {% for folderitem in folder.folderitems %}
                         {% if folderitem.external_url %}
-                        <li><a href="{{folderitem.external_url}}" target="_blank">{{folderitem.title}}</a></li>
+                        <li><a href="{{folderitem.external_url}}" target="_blank" rel="noopener">{{folderitem.title}}</a></li>
                         {% elsif page.url contains folderitem.url %}
                         <li class="dropdownActive"><a href="{{folderitem.url |  remove: "/"}}">{{folderitem.title}}</a></li>
                         {% else %}
diff --git a/_layouts/page.html b/_layouts/page.html
index 0929278..a1b4d65 100644
--- a/_layouts/page.html
+++ b/_layouts/page.html
@@ -41,7 +41,7 @@ layout: default
 
     {% if site.github_editme_path %}
 
-    <a target="_blank" href="https://github.com/{{site.github_editme_path}}{{page.path}}" class="btn btn-default githubEditButton" role="button"><i class="fa fa-github fa-lg"></i> Edit me</a>
+    <a target="_blank" rel="noopener" href="https://github.com/{{site.github_editme_path}}{{page.path}}" class="btn btn-default githubEditButton" role="button"><i class="fa fa-github fa-lg"></i> Edit me</a>
 
     {% endif %}
 
diff --git a/pages/mydoc/mydoc_commenting_on_files.md b/pages/mydoc/mydoc_commenting_on_files.md
index 80de542..7d74844 100644
--- a/pages/mydoc/mydoc_commenting_on_files.md
+++ b/pages/mydoc/mydoc_commenting_on_files.md
@@ -22,7 +22,7 @@ Here's the code for that button on the page.html layout for GitHub:
 ```
 {% raw %}{% if site.github_editme_path %}
 
-<a target="_blank" href="https://github.com/{{site.github_editme_path}}/{{page.folder}}{{page.url | append: ".md"}}{% endif %}" class="btn btn-default githubEditButton" role="button"><i class="fa fa-github fa-lg"></i> Edit me</a>
+<a target="_blank" rel="noopener" href="https://github.com/{{site.github_editme_path}}/{{page.folder}}{{page.url | append: ".md"}}{% endif %}" class="btn btn-default githubEditButton" role="button"><i class="fa fa-github fa-lg"></i> Edit me</a>
 
 {% endif %}{% endraw %}
 ```
@@ -33,7 +33,7 @@ and here for GitLab:
 ```
 {% raw %}{% if site.gitlab_editme_path %}
 
-<a target="_blank" href="https://github.com/{{site.gitlab_editme_path}}/{{page.folder}}{{page.url | append: ".md"}}{% endif %}" class="btn btn-default githubEditButton" role="button"><i class="fa fa-gitlab fa-lg"></i> Edit me</a>
+<a target="_blank" rel="noopener" href="https://github.com/{{site.gitlab_editme_path}}/{{page.folder}}{{page.url | append: ".md"}}{% endif %}" class="btn btn-default githubEditButton" role="button"><i class="fa fa-gitlab fa-lg"></i> Edit me</a>
 
 {% endif %}{% endraw %}
 ```
diff --git a/pages/mydoc/mydoc_generating_pdfs.md b/pages/mydoc/mydoc_generating_pdfs.md
index 576c170..f908c37 100644
--- a/pages/mydoc/mydoc_generating_pdfs.md
+++ b/pages/mydoc/mydoc_generating_pdfs.md
@@ -378,7 +378,7 @@ What this does is allow the prince-list.txt and toc.html files to iterate throug
 You can add a download button for your PDF using some Bootstrap button code:
 
 ```html
-<a target="_blank" class="noCrossRef" href="/pdf/mydoc.pdf"><button type="button" class="btn btn-default" aria-label="Left Align"><span class="glyphicon glyphicon-download-alt" aria-hidden="true"></span> PDF Download</button></a>
+<a target="_blank" rel="noopener" class="noCrossRef" href="/pdf/mydoc.pdf"><button type="button" class="btn btn-default" aria-label="Left Align"><span class="glyphicon glyphicon-download-alt" aria-hidden="true"></span> PDF Download</button></a>
 ```
 
 Here's what that looks like:
diff --git a/pages/mydoc/mydoc_help_api.md b/pages/mydoc/mydoc_help_api.md
index b8acc95..ebb771b 100644
--- a/pages/mydoc/mydoc_help_api.md
+++ b/pages/mydoc/mydoc_help_api.md
@@ -15,7 +15,7 @@ You can create a help API that developers can use to pull in content.
 
 For the full code demo, see the notes in the [Tooltips file](tooltips.html).
 
-In this demo, the popovers pull in and display content from the information in a <a target="_blank" href="tooltips.json">tooltips.json</a> file located in the same directory.
+In this demo, the popovers pull in and display content from the information in a <a target="_blank" rel="noopener" href="tooltips.json">tooltips.json</a> file located in the same directory.
 
 Instead of placing the JSON source in the same directory, you could also host the JSON file on another site.
 
@@ -134,7 +134,7 @@ This code will loop through all pages in the tooltips collection and insert the
 }
 ```
 
-You can also view the same JSON file here: <a target="_blank" href="tooltips.json">tooltips.json</a>.
+You can also view the same JSON file here: <a target="_blank" rel="noopener" href="tooltips.json">tooltips.json</a>.
 
 You can add different fields depending on how you want the JSON to be structured. Here we just have to fields: `doc_id` and `body`. And the JSON is looking just in the tooltips collection that we created.
 
@@ -236,7 +236,7 @@ Developers can access the help using the `.get` method from jQuery, among other
              });{% endraw %}
 ```
 
-View the <a target="_blank" href="tooltips.html" class="noCrossRef">tooltip demo</a> for a demonstration. See the source code for full code details.
+View the <a target="_blank" rel="noopener" href="tooltips.html" class="noCrossRef">tooltip demo</a> for a demonstration. See the source code for full code details.
 
 The `url` in the demo is relative, but you could equally point it to an absolute path on a remote host assuming CORS is enabled on the host.
 
@@ -275,7 +275,7 @@ Again, see the <a class="noCrossRef" href="tooltips.html">Tooltip Demo</a> for a
 
 Note that even though you reference a Bootstrap JS script, Bootstrap's popovers require you to initialize them using the above code as well &mdash; they aren't turned on by default.
 
-View the source code of the <a target="_blank" href="tooltips.html" class="noCrossRef">tooltip demo</a> for the full comments.
+View the source code of the <a target="_blank" rel="noopener" href="tooltips.html" class="noCrossRef">tooltip demo</a> for the full comments.
 
 ## 8. Create easy links to embed the help in your help site
 
diff --git a/pages/mydoc/mydoc_sidebar_navigation.md b/pages/mydoc/mydoc_sidebar_navigation.md
index c7a0863..fd10d83 100644
--- a/pages/mydoc/mydoc_sidebar_navigation.md
+++ b/pages/mydoc/mydoc_sidebar_navigation.md
@@ -46,7 +46,7 @@ For example, the sidebar.html file contains the following code:
 {% raw %}
 ```liquid
 {% if folderitem.external_url %}
-    <li><a href="{{folderitem.external_url}}" target="_blank">{{folderitem.title}}</a></li>
+    <li><a href="{{folderitem.external_url}}" target="_blank" rel="noopener">{{folderitem.title}}</a></li>
 ```
 {% endraw %}
 
diff --git a/pdfconfigs/prince-list.txt b/pdfconfigs/prince-list.txt
index 0ca0247..359c75d 100644
--- a/pdfconfigs/prince-list.txt
+++ b/pdfconfigs/prince-list.txt
@@ -43,7 +43,7 @@ search: exclude
            {% for folderitem in folder.folderitems %}
            {% if folderitem.output contains "web" %}
            {% if folderitem.external_url %}
-           <li><a href="{{folderitem.external_url}}" target="_blank">{{folderitem.title}}</a></li>
+           <li><a href="{{folderitem.external_url}}" target="_blank" rel="noopener">{{folderitem.title}}</a></li>
            {% elsif page.url == folderitem.url %}
            <li class="active"><a href="{{folderitem.url | remove: "/"}}">{{folderitem.title}}</a></li>
            {% elsif folderitem.type == "empty" %}
@@ -60,7 +60,7 @@ search: exclude
                    {% for subfolderitem in subfolders.subfolderitems %}
                    {% if subfolderitem.output contains "web" %}
                    {% if subfolderitem.external_url %}
-                   <li><a href="{{subfolderitem.external_url}}" target="_blank">{{subfolderitem.title}}</a></li>
+                   <li><a href="{{subfolderitem.external_url}}" target="_blank" rel="noopener">{{subfolderitem.title}}</a></li>
                    {% elsif page.url == subfolderitem.url %}
                    <li class="active"><a href="{{subfolderitem.url | remove: "/"}}">{{subfolderitem.title}}</a></li>
                    {% else %}