1 files changed, 25 insertions, 0 deletions
diff --git a/browser/base/content/test/favicons/browser_oversized.js b/browser/base/content/test/favicons/browser_oversized.js
new file mode 100644
index 0000000000..4756873a30
--- /dev/null
+++ b/browser/base/content/test/favicons/browser_oversized.js
@@ -0,0 +1,25 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const ROOT =
+  "http://mochi.test:8888/browser/browser/base/content/test/favicons/";
+
+add_task(async () => {
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:blank" },
+    async browser => {
+      let faviconPromise = waitForFaviconMessage(true, `${ROOT}large.png`);
+
+      BrowserTestUtils.loadURIString(browser, ROOT + "large_favicon.html");
+      await BrowserTestUtils.browserLoaded(browser);
+
+      await Assert.rejects(
+        faviconPromise,
+        result => {
+          return result.iconURL == `${ROOT}large.png`;
+        },
+        "Should have failed to load the large icon."
+      );
+    }
+  );
+});