diff --git a/src/start/index.en.html b/src/start/index.en.html
index 6a67f434e5f0bca32604bb1c5c531cf102e434da_c3JjL3N0YXJ0L2luZGV4LmVuLmh0bWw=..0ad3907d44ed2563303061e5d983ff90bbd80dbf_c3JjL3N0YXJ0L2luZGV4LmVuLmh0bWw= 100644
--- a/src/start/index.en.html
+++ b/src/start/index.en.html
@@ -28,8 +28,8 @@
     // var ua="Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0rc3) Gecko/20020523"
 
     // Search for the Gecko build date in the User Agent string
-    const buildID = ua.match(/Gecko\/(\d{8,10}) SeaMonkey/);
-    if (!buildID) {
+    const buildID = ua.match(/Gecko\/(\d{8,10})/);
+    if (!buildID || !ua.match(/ SeaMonkey\//)) {
       // not SeaMonkey, display a "get SeaMonkey" box
       highlightDownload("download");
       document.getElementById("stable").style.display = "none";