diff --git a/ext/setup/script.js b/ext/setup/script.js
index ee6d067e..baea92eb 100644
--- a/ext/setup/script.js
+++ b/ext/setup/script.js
@@ -5,25 +5,31 @@ document.addEventListener('DOMContentLoaded', () => {
     if(checkbox !== null && out_span !== null) {
         checkbox.disabled = true;
         out_span.innerHTML = '(testing...)';
+        const test_url = document.body.getAttribute('data-base-href') + "/nicetest";
+        console.log("NiceURL testing with", test_url);
 
-        fetch(document.body.getAttribute('data-base-href') + "/nicetest").then(response => {
+        fetch(test_url).then(response => {
             if(!response.ok) {
                 checkbox.disabled = true;
                 out_span.innerHTML = '(http error)';
+                console.log("NiceURL test got HTTP error:", response.status, response.statusText);
             } else {
                 response.text().then(text => {
                     if(text === 'ok') {
                         checkbox.disabled = false;
                         out_span.innerHTML = '(test passed)';
+                        console.log("NiceURL test passed");
                     } else {
                         checkbox.disabled = true;
                         out_span.innerHTML = '(test failed)';
+                        console.log("NiceURL test got wrong content:", text);
                     }
                 });
             }
-        }).catch(() => {
+        }).catch((e) => {
             checkbox.disabled = true;
             out_span.innerHTML = '(request failed)';
+            console.log("NiceURL test hit an exception:", e);
         });
     }
 });