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diff --git a/devtools/client/inspector/flexbox/test/browser_flexbox_sizing_flexibility_not_displayed_when_useless.js b/devtools/client/inspector/flexbox/test/browser_flexbox_sizing_flexibility_not_displayed_when_useless.js
new file mode 100644
index 0000000000..e25ebd5a6a
--- /dev/null
+++ b/devtools/client/inspector/flexbox/test/browser_flexbox_sizing_flexibility_not_displayed_when_useless.js
@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that the flexibility section in the flex item sizing properties is not displayed
+// when the item did not grow or shrink.
+
+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, store } = flexboxInspector;
+
+  info(
+    "Select an item with flex:0 and wait for the sizing info to be rendered"
+  );
+  let onUpdate = waitForDispatch(store, "UPDATE_FLEXBOX");
+  await selectNode("#did-not-grow-or-shrink div", inspector);
+  await onUpdate;
+
+  let flexSections = doc.querySelectorAll(
+    ".flex-item-sizing .section.flexibility"
+  );
+  is(
+    flexSections.length,
+    0,
+    "The flexibility section was not found in the DOM"
+  );
+
+  info(
+    "Select a more complex item which also doesn't flex and wait for the sizing info"
+  );
+  onUpdate = waitForDispatch(store, "UPDATE_FLEXBOX");
+  await selectNode(
+    "#just-enough-space-for-clamped-items div:last-child",
+    inspector
+  );
+  await onUpdate;
+
+  flexSections = doc.querySelectorAll(".flex-item-sizing .section.flexibility");
+  is(
+    flexSections.length,
+    0,
+    "The flexibility section was not found in the DOM"
+  );
+});