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diff --git a/netwerk/test/mochitests/test_accept_header.html b/netwerk/test/mochitests/test_accept_header.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Accept header</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<script>
+SimpleTest.requestCompleteLog();
+
+// All the requests are sent to test_accept_header.sjs which will return
+// different content based on the queryString. When the queryString is 'get',
+// test_accept_header.sjs returns a JSON object with the latest request and its
+// accept header value.
+
+function test_last_request_and_continue(query, expected) {
+ fetch("test_accept_header.sjs?get").then(r => r.json()).then(json => {
+ is(json.type, query, "Expected: " + query);
+ is(json.accept, expected, "Accept header: " + expected);
+ next();
+ });
+}
+
+function test_iframe() {
+ let ifr = document.createElement("iframe");
+ ifr.src = "test_accept_header.sjs?iframe";
+ ifr.onload = () => {
+ test_last_request_and_continue("iframe", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8");
+ };
+ document.body.appendChild(ifr);
+}
+
+function test_image() {
+ let i = new Image();
+ i.src = "test_accept_header.sjs?image";
+ i.onload = function() {
+ // Fetch spec says we should have: "image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5"
+ test_last_request_and_continue("image", "image/avif,image/webp,*/*");
+ }
+}
+
+function test_style() {
+ let head = document.getElementsByTagName("head")[0];
+ let link = document.createElement("link");
+ link.rel = "stylesheet";
+ link.type = "text/css";
+ link.href = "test_accept_header.sjs?style";
+ link.onload = () => {
+ test_last_request_and_continue("style", "text/css,*/*;q=0.1");
+ };
+ head.appendChild(link);
+}
+
+function test_worker() {
+ let w = new Worker("test_accept_header.sjs?worker");
+ w.onmessage = function() {
+ test_last_request_and_continue("worker", "*/*");
+ }
+}
+
+let tests = [
+ test_iframe,
+ test_image,
+ test_style,
+ test_worker,
+];
+
+function next() {
+ if (!tests.length) {
+ SimpleTest.finish();
+ return;
+ }
+
+ let test = tests.shift();
+ test();
+}
+
+SimpleTest.waitForExplicitFinish();
+
+SpecialPowers.pushPrefEnv({ "set": [
+ [ "dom.enable_performance_observer", true ]
+]}, next);
+
+</script>
+</body>
+</html>