diff --git a/browser/components/preferences/in-content/tests/browser_extension_controlled.js b/browser/components/preferences/in-content/tests/browser_extension_controlled.js
index e0092052f582..e8fb5fa36453 100644
--- a/browser/components/preferences/in-content/tests/browser_extension_controlled.js
+++ b/browser/components/preferences/in-content/tests/browser_extension_controlled.js
@@ -274,6 +274,8 @@ add_task(async function testExtensionControlledNewTab() {
   is(controlledContent.hidden, true, "The extension controlled row is hidden");
 
   await BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  let addon = await AddonManager.getAddonByID("@set_newtab");
+  addon.uninstall();
 });
 
 add_task(async function testExtensionControlledHomepageUninstalledAddon() {