1 files changed, 39 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_remoteness_change_listeners.js b/toolkit/content/tests/browser/browser_remoteness_change_listeners.js
new file mode 100644
index 0000000000..80e940ab29
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_remoteness_change_listeners.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Check that adding progress listeners to a browser doesn't break things
+ * when switching the remoteness of that browser.
+ */
+add_task(async function test_remoteness_switch_listeners() {
+  await BrowserTestUtils.withNewTab("about:support", async function (browser) {
+    let wpl;
+    let navigated = new Promise(resolve => {
+      wpl = {
+        onLocationChange() {
+          is(browser.currentURI.spec, "https://example.com/");
+          if (browser.currentURI?.spec == "https://example.com/") {
+            resolve();
+          }
+        },
+        QueryInterface: ChromeUtils.generateQI([
+          Ci.nsISupportsWeakReference,
+          Ci.nsIWebProgressListener2,
+          Ci.nsIWebProgressListener,
+        ]),
+      };
+      browser.addProgressListener(wpl);
+    });
+
+    let loaded = BrowserTestUtils.browserLoaded(
+      browser,
+      null,
+      "https://example.com/"
+    );
+    BrowserTestUtils.loadURIString(browser, "https://example.com/");
+    await Promise.all([loaded, navigated]);
+    browser.removeProgressListener(wpl);
+  });
+});