diff --git a/docs/javascripts/external-links.js b/docs/javascripts/external-links.js
new file mode 100644
index 0000000..de1d19e
--- /dev/null
+++ b/docs/javascripts/external-links.js
@@ -0,0 +1,40 @@
+// Open External Links in New Tab
+
+document.addEventListener('DOMContentLoaded', domContentLoaded)
+
+const observer = new MutationObserver(mutationObserver)
+
+function domContentLoaded() {
+    for (const el of document.querySelectorAll('a')) {
+        processLink(el)
+    }
+    observer.observe(document, {
+        childList: true,
+        subtree: true,
+    })
+}
+
+function mutationObserver(mutationList) {
+    // console.debug('mutationList:', mutationList)
+    for (const mutation of mutationList) {
+        // console.debug('mutation:', mutation)
+        mutation.addedNodes.forEach((el) => {
+            // console.debug('el:', el)
+            if (el.classList?.contains('md-container')) {
+                // console.debug('md-container:', el)
+                for (const el of document.querySelectorAll('a')) {
+                    processLink(el)
+                }
+            }
+        })
+    }
+}
+
+function processLink(el) {
+    // console.debug('checking el:', el)
+    if (el.host !== window.location.host) {
+        // console.debug('updating el:', el)
+        el.target = '_blank'
+        el.rel = 'noopener'
+    }
+}
diff --git a/zensical.toml b/zensical.toml
index a6a7e2b..4fb231f 100644
--- a/zensical.toml
+++ b/zensical.toml
@@ -12,9 +12,9 @@ site_url = "https://zensical-action.cssnr.com/"
 
 # https://zensical.org/docs/setup/basics/#copyright
 copyright = """
-<a href="https://github.com/cssnr/zensical-action-docs" target="_blank">Zensical Action Docs</a>
+<a href="https://github.com/cssnr/zensical-action-docs">Zensical Action Docs</a>
 <br>
-Built with <a href="https://github.com/zensical/zensical" target="_blank">Zensical</a>
+Built with <a href="https://github.com/zensical/zensical">Zensical</a>
 """
 
 # https://zensical.org/docs/setup/navigation/
@@ -29,7 +29,7 @@ nav = [
 #extra_css = ["assets/stylesheets/extra.css"]
 
 # https://zensical.org/docs/customization/#additional-javascript
-#extra_javascript = ["assets/javascript/extra.js"]
+extra_javascript = ["javascripts/external-links.js"]
 
 # ----------------------------------------------------------------------------
 # Section for configuring theme options