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diff --git a/devtools/client/inspector/rules/test/browser_rules_flexbox-toggle_04.js b/devtools/client/inspector/rules/test/browser_rules_flexbox-toggle_04.js
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+++ b/devtools/client/inspector/rules/test/browser_rules_flexbox-toggle_04.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test toggling the flexbox highlighter in the rule view from a
+// 'display: flex!important' declaration.
+
+const TEST_URI = `
+  <style type='text/css'>
+    #flex {
+      display: flex !important;
+    }
+  </style>
+  <div id="flex"></div>
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, view } = await openRuleView();
+  const HIGHLIGHTER_TYPE = inspector.highlighters.TYPES.FLEXBOX;
+  const {
+    getActiveHighlighter,
+    getNodeForActiveHighlighter,
+    waitForHighlighterTypeShown,
+    waitForHighlighterTypeHidden,
+  } = getHighlighterTestHelpers(inspector);
+
+  await selectNode("#flex", inspector);
+  const container = getRuleViewProperty(view, "#flex", "display").valueSpan;
+  const flexboxToggle = container.querySelector(
+    ".js-toggle-flexbox-highlighter"
+  );
+
+  info("Checking the initial state of the flexbox toggle in the rule-view.");
+  ok(flexboxToggle, "Flexbox highlighter toggle is visible.");
+  ok(
+    !flexboxToggle.classList.contains("active"),
+    "Flexbox highlighter toggle button is not active."
+  );
+  ok(
+    !getActiveHighlighter(HIGHLIGHTER_TYPE),
+    "No flexbox highlighter exists in the rule-view."
+  );
+  ok(
+    !getNodeForActiveHighlighter(HIGHLIGHTER_TYPE),
+    "No flexbox highlighter is shown."
+  );
+
+  info("Toggling ON the flexbox highlighter from the rule-view.");
+  const onHighlighterShown = waitForHighlighterTypeShown(HIGHLIGHTER_TYPE);
+  flexboxToggle.click();
+  await onHighlighterShown;
+
+  info(
+    "Checking the flexbox highlighter is created and toggle button is active in " +
+      "the rule-view."
+  );
+  ok(
+    flexboxToggle.classList.contains("active"),
+    "Flexbox highlighter toggle is active."
+  );
+  ok(
+    getActiveHighlighter(HIGHLIGHTER_TYPE),
+    "Flexbox highlighter created in the rule-view."
+  );
+  ok(
+    getNodeForActiveHighlighter(HIGHLIGHTER_TYPE),
+    "Flexbox highlighter is shown."
+  );
+
+  info("Toggling OFF the flexbox highlighter from the rule-view.");
+  const onHighlighterHidden = waitForHighlighterTypeHidden(HIGHLIGHTER_TYPE);
+  flexboxToggle.click();
+  await onHighlighterHidden;
+
+  info(
+    "Checking the flexbox highlighter is not shown and toggle button is not active " +
+      "in the rule-view."
+  );
+  ok(
+    !flexboxToggle.classList.contains("active"),
+    "Flexbox highlighter toggle button is not active."
+  );
+  ok(
+    !getActiveHighlighter(HIGHLIGHTER_TYPE),
+    "No flexbox highlighter is shown."
+  );
+});