2 files changed, 27 insertions, 0 deletions
diff --git a/dom/base/test/fmm/browser.toml b/dom/base/test/fmm/browser.toml
new file mode 100644
index 0000000000..064189b03d
--- /dev/null
+++ b/dom/base/test/fmm/browser.toml
@@ -0,0 +1,4 @@
+[DEFAULT]
+
+["browser_frame_message_manager_cache.js"]
+
diff --git a/dom/base/test/fmm/browser_frame_message_manager_cache.js b/dom/base/test/fmm/browser_frame_message_manager_cache.js
new file mode 100644
index 0000000000..fcedd6721a
--- /dev/null
+++ b/dom/base/test/fmm/browser_frame_message_manager_cache.js
@@ -0,0 +1,23 @@
+add_task(async function testCacheAfterInvalidate() {
+  // Load some page to make scripts cached.
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:addons"
+  );
+
+  // Discard ScriptPreloader cache.
+  Services.obs.notifyObservers(null, "startupcache-invalidate");
+
+  // Load some other page to use the cache in nsMessageManagerScriptExecutor
+  // cache.
+  let tab2 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:preferences"
+  );
+
+  // Verify the browser doesn't crash.
+  ok(true);
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+});