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diff --git a/devtools/client/inspector/test/browser_inspector_highlighter-08.js b/devtools/client/inspector/test/browser_inspector_highlighter-08.js
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+++ b/devtools/client/inspector/test/browser_inspector_highlighter-08.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// Test that performing multiple requests to highlight nodes or to hide the highlighter,
+// without waiting for the former ones to complete, still works well.
+add_task(async function () {
+  info("Loading the test document and opening the inspector");
+  const { inspector, highlighterTestFront } = await openInspectorForURL(
+    "data:text/html,"
+  );
+  const html = await getNodeFront("html", inspector);
+  const body = await getNodeFront("body", inspector);
+  const type = inspector.highlighters.TYPES.BOXMODEL;
+  const getActiveHighlighter = () => {
+    return inspector.highlighters.getActiveHighlighter(type);
+  };
+  is(getActiveHighlighter(), null, "The highlighter is hidden by default");
+
+  info("Highlight <body>, and hide the highlighter immediately after");
+  await Promise.all([
+    inspector.highlighters.showHighlighterTypeForNode(type, body),
+    inspector.highlighters.hideHighlighterType(type),
+  ]);
+  is(getActiveHighlighter(), null, "The highlighter is hidden");
+
+  info("Highlight <body>, then <html>, then <body> again, synchronously");
+  await Promise.all([
+    inspector.highlighters.showHighlighterTypeForNode(type, body),
+    inspector.highlighters.showHighlighterTypeForNode(type, html),
+    inspector.highlighters.showHighlighterTypeForNode(type, body),
+  ]);
+  ok(
+    await highlighterTestFront.assertHighlightedNode("body"),
+    "The highlighter highlights <body>"
+  );
+
+  info("Highlight <html>, then <body>, then <html> again, synchronously");
+  await Promise.all([
+    inspector.highlighters.showHighlighterTypeForNode(type, html),
+    inspector.highlighters.showHighlighterTypeForNode(type, body),
+    inspector.highlighters.showHighlighterTypeForNode(type, html),
+  ]);
+  ok(
+    await highlighterTestFront.assertHighlightedNode("html"),
+    "The highlighter highlights <html>"
+  );
+
+  info("Hide the highlighter, and highlight <html> immediately after");
+  await Promise.all([
+    inspector.highlighters.hideHighlighterType(type),
+    inspector.highlighters.showHighlighterTypeForNode(type, body),
+  ]);
+  ok(
+    await highlighterTestFront.assertHighlightedNode("body"),
+    "The highlighter highlights <body>"
+  );
+
+  info("Highlight <html>, and hide the highlighter immediately after");
+  await Promise.all([
+    inspector.highlighters.showHighlighterTypeForNode(type, html),
+    inspector.highlighters.hideHighlighterType(type),
+  ]);
+  is(getActiveHighlighter(), null, "The highlighter is hidden");
+});