diff --git a/config.toml b/config.toml
index a482b14b7..0271327b9 100644
--- a/config.toml
+++ b/config.toml
@@ -39,7 +39,7 @@ render_emoji = false
 
 # Whether external links are to be opened in a new tab
 # If this is true, a `rel="noopener"` will always automatically be added for security reasons
-external_links_target_blank = true
+external_links_target_blank = false
 
 # Whether to set rel="nofollow" for all external links
 external_links_no_follow = true
diff --git a/templates/partials/header.html b/templates/partials/header.html
index 69e6a84cd..fc46a2cb4 100644
--- a/templates/partials/header.html
+++ b/templates/partials/header.html
@@ -35,9 +35,11 @@
                     {% set link_label = header_label | striptags %}
                     {% set link_path = header_label | split(pat="%22") | safe%}
                     {% if header_label is containing("http") %}
-                    <a href="{{link_path[1]}}" target="_blank" class="text-lg leading-6 font-medium text-gray-900 hover:text-gray-500 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150 mt-0">
-                        {{link_label}}
-                    </a>
+                        {% if header_label is not containing("threefold") %}
+                        <a href="{{link_path[1]}}" target="_blank" class="text-lg leading-6 font-medium text-gray-900 hover:text-gray-500 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150 mt-0">
+                            {{link_label}}
+                        </a>
+                        {% endif %}
                     {% else %}
                     <a href="{{ get_url(path=link_path[1])}}" class="text-lg leading-6 font-medium text-gray-900 hover:text-gray-500 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150 mt-0">
                       {{link_label}}
@@ -163,9 +165,11 @@
                                 {% set link_label = header_label | striptags %}
                                 {% set link_path = header_label | split(pat="%22") | safe%}
                                 {% if header_label is containing("http") %}
-                                <a href="{{link_path[1]}}" target="_blank" class="text-lg px-8 py-3 leading-6 font-normal text-gray-900 hover:text-gray-900 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150">
-                                    {{link_label}}
-                                </a>
+                                    {% if header_label is not containing("threefold") %}
+                                    <a href="{{link_path[1]}}" target="_blank" class="text-lg px-8 py-3 leading-6 font-normal text-gray-900 hover:text-gray-900 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150">
+                                        {{link_label}}
+                                    </a>
+                                    {% endif %}
                                 {% else %}
                                 <a href="{{ get_url(path=link_path[1])}}" class="text-lg px-8 py-3 leading-6 font-normal text-gray-900 hover:text-gray-900 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150">
                                     {{link_label}}
diff --git a/templates/shortcodes/button.html b/templates/shortcodes/button.html
index 8012b8cfe..4fffee49a 100644
--- a/templates/shortcodes/button.html
+++ b/templates/shortcodes/button.html
@@ -2,10 +2,14 @@
 | trim_end_matches(pat='"') %}
 
 {% if 'https' in url %}
-<button onclick="window.open('{{url}}', '_blank');"
-    class="leading-6 border-transparent flex flex-col border-2 w-full items-start rounded transition hover:first:text-gray-500 hover:border-stone-200 hover:bg-stone-100 p-2 text-left">
-    {{ body | trim_start_matches(pat="<p>") | safe}}
-</button>
+    {% if url is not containing("threefold") %}
+        {% if url is not containing("localhost") %}
+        <button onclick="window.open('{{url}}', '_blank');"
+            class="leading-6 border-transparent flex flex-col border-2 w-full items-start rounded transition hover:first:text-gray-500 hover:border-stone-200 hover:bg-stone-100 p-2 text-left">
+            {{ body | trim_start_matches(pat="<p>") | safe}}
+        </button>
+        {% endif %}
+    {% endif %}
 
 {% else %}
 <button onclick="window.location='{{get_url(path=url)}}'"