diff --git a/tests/test.h264.js b/tests/test.h264.js
index 438470fed..ca550e4de 100644
--- a/tests/test.h264.js
+++ b/tests/test.h264.js
@@ -78,10 +78,11 @@ async function haveH264Decode() {
         'NjAgcXBtaW49MCBxcG1heD02OSBxcHN0ZXA9NCBpcF9yYXRpbz0xLjQwIGFx' +
         'PTE6MS4wMACAAAABZYiEBrxmKAAPVccAAS044AA5DRJMnkycJk4TPw=='));
 
+    let gotframe = false;
     let error = null;
 
     let decoder = new VideoDecoder({
-        output: frame => {},
+        output: frame => { gotframe = true; },
         error: e => { console.log("error");error = e; },
     });
     let chunk = new EncodedVideoChunk({
@@ -101,7 +102,17 @@ async function haveH264Decode() {
         error = e;
     }
 
+    console.log(gotframe);
     console.log(error);
+
+    // Firefox fails to deliver the error on Windows, so we need to
+    // check if we got a frame instead
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=1932392
+    if (!gotframe) {
+        _haveH264Decode = false;
+        return _haveH264Decode;
+    }
+
     _haveH264Decode = error === null;
 
     return _haveH264Decode;