1 files changed, 14 insertions, 4 deletions
diff --git a/devtools/client/inspector/rules/test/browser_rules_large_base64_background_image.js b/devtools/client/inspector/rules/test/browser_rules_large_base64_background_image.js
index 0373d29321..717cc9bfb5 100644
--- a/devtools/client/inspector/rules/test/browser_rules_large_base64_background_image.js
+++ b/devtools/client/inspector/rules/test/browser_rules_large_base64_background_image.js
@@ -43,10 +43,20 @@ add_task(async function () {
   const { inspector } = await openInspectorForURL(TEST_URL);
   const view = selectRuleView(inspector);
 
-  await selectNode("body", inspector);
-
-  const propertyValues = view.styleDocument.querySelectorAll(
-    ".ruleview-propertyvalue"
+  let propertyValues;
+  await waitFor(
+    async () => {
+      await selectNode("body", inspector);
+      propertyValues = view.styleDocument.querySelectorAll(
+        ".ruleview-propertyvalue"
+      );
+      return propertyValues.length == 2;
+    },
+    "Timed out while waiting for body element properties",
+    // Use default interval.
+    10,
+    // reduce maxTries to 50 since `selectNode` is already async.
+    50
   );
 
   is(propertyValues.length, 2, "Ruleview has 2 propertyvalue elements");