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diff --git a/devtools/server/tests/mochitest/inspector-delay-image-response.sjs b/devtools/server/tests/mochitest/inspector-delay-image-response.sjs
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+++ b/devtools/server/tests/mochitest/inspector-delay-image-response.sjs
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+/**
+ * Adapted from https://dxr.mozilla.org/mozilla-central/rev/
+ * 4e883591bb5dff021c108d3e30198a99547eed1e/layout/reftests/backgrounds/
+ * delay-image-response.sjs
+ */
+"use strict";
+
+// A 1x1 PNG image.
+// Source: https://commons.wikimedia.org/wiki/File:1x1.png (Public Domain)
+const IMAGE = atob("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAA" +
+ "ACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=");
+
+// To avoid GC.
+let timer = null;
+
+function handleRequest(request, response) {
+ let query = {};
+ request.queryString.split("&").forEach(function(val) {
+ let [name, value] = val.split("=");
+ query[name] = unescape(value);
+ });
+
+ response.setStatusLine(request.httpVersion, 200, "OK");
+ response.setHeader("Content-Type", "image/png", false);
+
+ // If there is no delay, we write the image and leave.
+ if (!("delay" in query)) {
+ response.write(IMAGE);
+ return;
+ }
+
+ // If there is a delay, we create a timer which, when it fires, will write
+ // image and leave.
+ response.processAsync();
+ const nsITimer = Components.interfaces.nsITimer;
+
+ timer = Components.classes["@mozilla.org/timer;1"].createInstance(nsITimer);
+ timer.initWithCallback(function() {
+ response.write(IMAGE);
+ response.finish();
+ }, query.delay, nsITimer.TYPE_ONE_SHOT);
+}