1 files changed, 3 insertions, 4 deletions
diff --git a/toolkit/components/extensions/test/browser/browser_ext_themes_separators.js b/toolkit/components/extensions/test/browser/browser_ext_themes_separators.js
index 4da4927ccf..1b953269b6 100644
--- a/toolkit/components/extensions/test/browser/browser_ext_themes_separators.js
+++ b/toolkit/components/extensions/test/browser/browser_ext_themes_separators.js
@@ -48,10 +48,9 @@ add_task(async function test_support_separator_properties() {
   await deprecatedMessagePromise;
 
   let navbar = document.querySelector("#nav-bar");
-  Assert.ok(
-    window
-      .getComputedStyle(navbar)
-      .boxShadow.includes(`rgb(${hexToRGB(SEPARATOR_TOP_COLOR).join(", ")})`),
+  Assert.equal(
+    window.getComputedStyle(navbar).borderTopColor,
+    `rgb(${hexToRGB(SEPARATOR_TOP_COLOR).join(", ")})`,
     "Top separator color properly set"
   );