--- a/devtools/shared/webconsole/test/test_jsterm.html
+++ b/devtools/shared/webconsole/test/test_jsterm.html
@@ -60,19 +60,17 @@ function onAttach(aState, aResponse)
     top.largeObject2['a' + i] = i;
   }
 
   gState = aState;
 
   let tests = [doSimpleEval, doWindowEval, doEvalWithException,
                doEvalWithHelper, doEvalString, doEvalLongString,
                doEvalWithBinding, doEvalWithBindingFrame,
-               forceLexicalInit].map(t => {
-                 return Task.async(t);
-               });
+               forceLexicalInit];
 
   runTests(tests, testEnd);
 }
 
 async function doSimpleEval() {
   info("test eval '2+2'");
   let response = await evaluateJS("2+2");
   checkObject(response, {

--- a/devtools/shared/webconsole/test/test_jsterm_autocomplete.html
+++ b/devtools/shared/webconsole/test/test_jsterm_autocomplete.html
@@ -72,19 +72,17 @@ let onAttach = async function (aState, r
       window.largeObject2['a' + i] = i;
     }
   `;
 
   await evaluateJS(script);
 
   let tests = [doAutocomplete1, doAutocomplete2, doAutocomplete3,
                doAutocomplete4, doAutocompleteLarge1,
-               doAutocompleteLarge2].map(t => {
-                 return Task.async(t);
-               });
+               doAutocompleteLarge2];
 
   runTests(tests, testEnd);
 };
 
 async function doAutocomplete1() {
   info("test autocomplete for 'window.foo'");
   let response = await autocompletePromise("window.foo", 10);
   let matches = response.matches;