Bug 1576871 - Clean up the allow list after the test 'testQuickSwitchTabAfterTogglingTPSwitch' in test browser_protections_UI.js r=nhnt11

Differential Revision: https://phabricator.services.mozilla.com/D43594

--HG--
extra : moz-landing-system : lando

browser/base/content/test/siteProtections/browser_protections_UI.js

@@ -615,6 +615,9 @@ add_task(async function testQuickSwitchTabAfterTogglingTPSwitch() {
     "The ETP state of the second tab has been changed to disabled."
   );
 
+  // Clean up the state of the allow list for the second tab.
+  ContentBlockingAllowList.remove(tabTwo.linkedBrowser);
+
   BrowserTestUtils.removeTab(tabOne);
   BrowserTestUtils.removeTab(tabTwo);