diff --git a/src/main/java/org/openqa/selenium/htmlunit/options/TypeCodec.java b/src/main/java/org/openqa/selenium/htmlunit/options/TypeCodec.java
index 02e37a74..5b28d887 100644
--- a/src/main/java/org/openqa/selenium/htmlunit/options/TypeCodec.java
+++ b/src/main/java/org/openqa/selenium/htmlunit/options/TypeCodec.java
@@ -380,7 +380,7 @@ else if (name.startsWith("Edge")) {
             seed = BrowserVersion.EDGE;
         }
         else if (name.startsWith("FF")) {
-            seed = (code == 115) ? BrowserVersion.FIREFOX_ESR : BrowserVersion.FIREFOX;
+            seed = (code == 128) ? BrowserVersion.FIREFOX_ESR : BrowserVersion.FIREFOX;
         }
         else {
             throw new IllegalArgumentException(