--- a/toolkit/components/extensions/test/xpcshell/test_ext_experiments.js
+++ b/toolkit/components/extensions/test/xpcshell/test_ext_experiments.js
@@ -116,17 +116,17 @@ async function testFooFailExperiment() {
 }
 
 add_task(async function test_bundled_experiments() {
   let testCases = [
     {isSystem: true, temporarilyInstalled: true, shouldHaveExperiments: true},
     {isSystem: true, temporarilyInstalled: false, shouldHaveExperiments: true},
     {isPrivileged: true, temporarilyInstalled: true, shouldHaveExperiments: true},
     {isPrivileged: true, temporarilyInstalled: false, shouldHaveExperiments: true},
-    {isPrivileged: false, temporarilyInstalled: true, shouldHaveExperiments: true},
+    {isPrivileged: false, temporarilyInstalled: true, shouldHaveExperiments: AppConstants.MOZ_ALLOW_LEGACY_EXTENSIONS},
     {isPrivileged: false, temporarilyInstalled: false, shouldHaveExperiments: false},
   ];
 
   async function background(shouldHaveExperiments) {
     if (shouldHaveExperiments) {
       await testFooExperiment();
     } else {
       await testFooFailExperiment();