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diff --git a/testing/web-platform/tests/css/css-grid/grid-with-content-dynamic-display-001.html b/testing/web-platform/tests/css/css-grid/grid-with-content-dynamic-display-001.html
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+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1740702">
+<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
+<style>
+ #grid {
+ display: grid;
+ width: 100px;
+ height: 100px;
+ background: red;
+ }
+
+ #initiallyHidden {
+ display: none;
+ width: 100px;
+ height: 100px;
+ background: green;
+ }
+</style>
+</head>
+<body>
+ <p>Test passes if there is a filled green square.</p>
+ <div id="grid">
+ <div>
+ <div>
+ <div>
+ <div id="initiallyHidden">
+ </div>
+ </div>
+ </div>
+ </div>
+ </div>
+ <script>
+ "use strict";
+
+ const grid = document.getElementById("grid");
+ const initiallyHidden = document.getElementById("initiallyHidden");
+ document.documentElement.offsetHeight; // Flush layout
+
+ // Fails in buggy Firefox build because it prevents reflows from happening
+ getComputedStyle(grid).getPropertyValue("grid-template-columns");
+
+ document.documentElement.offsetHeight; // Flush layout again
+
+ initiallyHidden.style.display = "block"; // This should trigger a reflow.
+ </script>
+</body>
+</html>