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diff --git a/devtools/client/inspector/flexbox/test/browser_flexbox_toggle_flexbox_highlighter_01.js b/devtools/client/inspector/flexbox/test/browser_flexbox_toggle_flexbox_highlighter_01.js
new file mode 100644
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+++ b/devtools/client/inspector/flexbox/test/browser_flexbox_toggle_flexbox_highlighter_01.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test toggling ON/OFF the flexbox highlighter from the flexbox inspector panel.
+
+const TEST_URI = URL_ROOT + "doc_flexbox_specific_cases.html";
+
+add_task(async function () {
+  await addTab(TEST_URI);
+  const { inspector, flexboxInspector } = await openLayoutView();
+  const { document: doc } = flexboxInspector;
+  const HIGHLIGHTER_TYPE = inspector.highlighters.TYPES.FLEXBOX;
+  const { getActiveHighlighter } = getHighlighterTestHelpers(inspector);
+
+  const onFlexHighlighterToggleRendered = waitForDOM(
+    doc,
+    "#flexbox-checkbox-toggle"
+  );
+  await selectNode("#container", inspector);
+  const [flexHighlighterToggle] = await onFlexHighlighterToggleRendered;
+
+  info("Checking the initial state of the Flexbox Inspector.");
+  ok(flexHighlighterToggle, "The flexbox highlighter toggle is rendered.");
+  ok(
+    !flexHighlighterToggle.checked,
+    "The flexbox highlighter toggle is unchecked."
+  );
+  ok(
+    !getActiveHighlighter(HIGHLIGHTER_TYPE),
+    "No flexbox highlighter is shown."
+  );
+
+  await toggleHighlighterON(flexHighlighterToggle, inspector);
+
+  info("Checking the flexbox highlighter is created.");
+  ok(getActiveHighlighter(HIGHLIGHTER_TYPE), "Flexbox highlighter is shown.");
+  ok(
+    flexHighlighterToggle.checked,
+    "The flexbox highlighter toggle is checked."
+  );
+
+  await toggleHighlighterOFF(flexHighlighterToggle, inspector);
+
+  info("Checking the flexbox highlighter is not shown.");
+  ok(
+    !getActiveHighlighter(HIGHLIGHTER_TYPE),
+    "No flexbox highlighter is shown."
+  );
+  ok(
+    !flexHighlighterToggle.checked,
+    "The flexbox highlighter toggle is unchecked."
+  );
+});