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diff --git a/devtools/server/tests/chrome/test_highlighter_paused_debugger.html b/devtools/server/tests/chrome/test_highlighter_paused_debugger.html
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+++ b/devtools/server/tests/chrome/test_highlighter_paused_debugger.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+Test the PausedDebuggerOverlay highlighter.
+-->
+<head>
+  <meta charset="utf-8">
+  <title>PausedDebuggerOverlay test</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+</head>
+<body>
+<pre id="test">
+<script>
+"use strict";
+
+window.onload = async function() {
+  SimpleTest.waitForExplicitFinish();
+
+  const {require} = ChromeUtils.importESModule("resource://devtools/shared/loader/Loader.sys.mjs");
+  require("devtools/server/actors/inspector/inspector");
+  const {HighlighterEnvironment} = require("devtools/server/actors/highlighters");
+  const {PausedDebuggerOverlay} = require("devtools/server/actors/highlighters/paused-debugger");
+
+  const env = new HighlighterEnvironment();
+  env.initFromWindow(window);
+
+  const highlighter = new PausedDebuggerOverlay(env);
+  await highlighter.isReady;
+  const anonymousContent = highlighter.markup.content;
+
+  const id = elementID => `${highlighter.ID_CLASS_PREFIX}${elementID}`;
+
+  function isHidden(elementID) {
+    const attr = anonymousContent.root.getElementById(id(elementID)).getAttribute("hidden");
+    return typeof attr === "string" && attr == "true";
+  }
+
+  function getReason() {
+    return anonymousContent.root.getElementById(id("reason")).textContent;
+  }
+
+  function isOverlayShown() {
+    const attr = anonymousContent.root.getElementById(id("root")).getAttribute("overlay");
+    return typeof attr === "string" && attr == "true";
+  }
+
+  info("Test that the various elements with IDs exist");
+  ok(highlighter.getElement("root"), "The root wrapper element exists");
+  ok(highlighter.getElement("toolbar"), "The toolbar element exists");
+  ok(highlighter.getElement("reason"), "The reason label element exists");
+
+  info("Test that the highlighter is hidden by default");
+  ok(isHidden("root"), "The highlighter is hidden");
+
+  info("Show the highlighter with overlay and toolbar");
+  let didShow = highlighter.show("breakpoint");
+  ok(didShow, "Calling show returned true");
+  ok(!isHidden("root"), "The highlighter is shown");
+  ok(isOverlayShown(), "The overlay is shown");
+  is(
+    getReason(),
+    "Paused on breakpoint",
+    "The reason displayed in the toolbar is correct"
+  );
+
+  info("Call show again with another reason");
+  didShow = highlighter.show("debuggerStatement");
+  ok(didShow, "Calling show returned true too");
+  ok(!isHidden("root"), "The highlighter is still shown");
+  is(getReason(), "Paused on debugger statement",
+     "The reason displayed in the toolbar is correct again");
+  ok(isOverlayShown(), "The overlay is still shown too");
+
+  info("Call show again but with no reason");
+  highlighter.show();
+  ok(isOverlayShown(), "The overlay is shown however");
+
+  info("Hide the highlighter");
+  highlighter.hide();
+  ok(isHidden("root"), "The highlighter is now hidden");
+
+  SimpleTest.finish();
+};
+</script>
+</pre>
+</body>
+</html>