diff --git a/mobile/android/components/extensions/test/mochitest/test_ext_tabs_executeScript_good.html b/mobile/android/components/extensions/test/mochitest/test_ext_tabs_executeScript_good.html
index dc04787a5640..04c8435c3ecc 100644
--- a/mobile/android/components/extensions/test/mochitest/test_ext_tabs_executeScript_good.html
+++ b/mobile/android/components/extensions/test/mochitest/test_ext_tabs_executeScript_good.html
@@ -13,7 +13,7 @@
 <script type="text/javascript">
 "use strict";
 
-function* testHasPermission(params) {
+async function testHasPermission(params) {
   let contentSetup = params.contentSetup || (() => Promise.resolve());
 
   async function background(contentSetup) {
@@ -47,22 +47,22 @@ function* testHasPermission(params) {
     },
   });
 
-  yield extension.startup();
-  yield extension.awaitMessage("ready");
+  await extension.startup();
+  await extension.awaitMessage("ready");
 
   if (params.setup) {
-    yield params.setup(extension);
+    await params.setup(extension);
   }
 
   extension.sendMessage("execute-script");
 
-  yield extension.awaitFinish("executeScript");
+  await extension.awaitFinish("executeScript");
 
   if (params.tearDown) {
-    yield params.tearDown(extension);
+    await params.tearDown(extension);
   }
 
-  yield extension.unload();
+  await extension.unload();
 }
 
 add_task(async function testGoodPermissions() {
diff --git a/mobile/android/tests/browser/chrome/test_web_channel.html b/mobile/android/tests/browser/chrome/test_web_channel.html
index 8410f5305606..9351dd222f84 100644
--- a/mobile/android/tests/browser/chrome/test_web_channel.html
+++ b/mobile/android/tests/browser/chrome/test_web_channel.html
@@ -34,7 +34,7 @@ Migrated from Robocop: https://bugzilla.mozilla.org/show_bug.cgi?id=1184186
   let gTests = [
     {
       desc: "WebChannel generic message",
-      run: function* () {
+      run() {
         return new Promise(function(resolve, reject) {
           let tab;
           let channel = new WebChannel("generic", Services.io.newURI(HTTP_PATH));
@@ -52,7 +52,7 @@ Migrated from Robocop: https://bugzilla.mozilla.org/show_bug.cgi?id=1184186
     },
     {
       desc: "WebChannel two way communication",
-      run: function* () {
+      run() {
         return new Promise(function(resolve, reject) {
           let tab;
           let channel = new WebChannel("twoway", Services.io.newURI(HTTP_PATH));
@@ -79,7 +79,7 @@ Migrated from Robocop: https://bugzilla.mozilla.org/show_bug.cgi?id=1184186
     },
     {
       desc: "WebChannel multichannel",
-      run: function* () {
+      run() {
         return new Promise(function(resolve, reject) {
           let tab;
           let channel = new WebChannel("multichannel", Services.io.newURI(HTTP_PATH));