--- a/browser/base/content/test/tabs/browser_multiselect_tabs_reorder.js
+++ b/browser/base/content/test/tabs/browser_multiselect_tabs_reorder.js
@@ -1,11 +1,19 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/ */
 
+const PREF_MULTISELECT_TABS = "browser.tabs.multiselect";
+
+add_task(async function setPref() {
+  await SpecialPowers.pushPrefEnv({
+    set: [[PREF_MULTISELECT_TABS, true]]
+  });
+});
+
 add_task(async function() {
   let tab0 = gBrowser.selectedTab;
   let tab1 = await addTab();
   let tab2 = await addTab();
   let tab3 = await addTab();
   let tab4 = await addTab();
   let tab5 = await addTab();
   let tabs = [tab0, tab1, tab2, tab3, tab4, tab5];