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diff --git a/layout/base/crashtests/1338772-1.html b/layout/base/crashtests/1338772-1.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<script>
+function loadHandler() {
+ var outer = document.getElementById("outer");
+ var inner = document.createElement("iframe");
+ inner.height = "1px";
+ outer.contentDocument.body.appendChild(inner);
+
+ // Flush reflow inside our inner iframe. This ensures that our inner.height
+ // tweak further down will actually invoke the resize handler.
+ inner.contentWindow.offsetTop;
+
+ // Set up resize handler (which ends the test, one way or another)
+ inner.contentWindow.onresize = () => {
+ outer.remove();
+ document.documentElement.removeAttribute("class");
+ };
+
+ // Trigger the resize handler:
+ inner.height = "5px";
+ inner.offsetTop;
+}
+
+// This function is a hack to avoid sporadic test-failures with...
+// "...timed out waiting for reftest-wait to be removed".
+// Occasionally, it seems this test loses a race condition of some sort, and
+// its resize handler isn't invoked. When that happens (and specifically, when
+// the test runs for longer than 500ms), we clear reftest-wait and call the
+// run a "pass" (which is kind of valid, because we didn't crash!) and move on.
+function setupFailsafe() {
+ setTimeout(() => {
+ document.documentElement.removeAttribute("class");
+ }, 500);
+}
+</script>
+<body onload="setupFailsafe()">
+ <iframe id="outer"
+ src="data:text/html,<html><body>"
+ onload="loadHandler()">
+ </iframe>
+</body>