--- a/toolkit/components/extensions/test/xpcshell/test_ext_storage_tab.js
+++ b/toolkit/components/extensions/test/xpcshell/test_ext_storage_tab.js
@@ -1,11 +1,13 @@
 "use strict";
 
-add_task(async function test_multiple_pages() {
+ChromeUtils.import("resource://gre/modules/ExtensionStorageIDB.jsm");
+
+async function test_multiple_pages() {
   let extension = ExtensionTestUtils.loadExtension({
     async background() {
       function awaitMessage(expectedMsg, api = "test") {
         return new Promise(resolve => {
           browser[api].onMessage.addListener(function listener(msg) {
             if (msg === expectedMsg) {
               browser[api].onMessage.removeListener(listener);
               resolve();
@@ -82,9 +84,19 @@ add_task(async function test_multiple_pa
   extension.onMessage("remove-page", async url => {
     await contentPage.close();
     extension.sendMessage("page-removed");
   });
 
   await extension.startup();
   await extension.awaitFinish("storage-multiple");
   await extension.unload();
+}
+
+add_task(async function test_storage_local_file_backend_from_tab() {
+  return runWithPrefs([[ExtensionStorageIDB.BACKEND_ENABLED_PREF, false]],
+                      test_multiple_pages);
 });
+
+add_task(async function test_storage_local_idb_backend_from_tab() {
+  return runWithPrefs([[ExtensionStorageIDB.BACKEND_ENABLED_PREF, true]],
+                      test_multiple_pages);
+});