4 files changed, 5 insertions, 5 deletions
diff --git a/browser/components/shell/test/browser_1119088.js b/browser/components/shell/test/browser_1119088.js
index bc0995fe51..62fc953f44 100644
--- a/browser/components/shell/test/browser_1119088.js
+++ b/browser/components/shell/test/browser_1119088.js
@@ -101,7 +101,7 @@ add_task(async function () {
       gBrowser,
       url: "about:logo",
     },
-    async browser => {
+    async () => {
       let dirSvc = Cc["@mozilla.org/file/directory_service;1"].getService(
         Ci.nsIDirectoryServiceProvider
       );
diff --git a/browser/components/shell/test/browser_420786.js b/browser/components/shell/test/browser_420786.js
index 025cd87943..9cbdc8c4b7 100644
--- a/browser/components/shell/test/browser_420786.js
+++ b/browser/components/shell/test/browser_420786.js
@@ -14,7 +14,7 @@ add_task(async function () {
       gBrowser,
       url: "about:logo",
     },
-    browser => {
+    () => {
       var brandName = Services.strings
         .createBundle("chrome://branding/locale/brand.properties")
         .GetStringFromName("brandShortName");
diff --git a/browser/components/shell/test/browser_setDesktopBackgroundPreview.js b/browser/components/shell/test/browser_setDesktopBackgroundPreview.js
index b2dbe13db8..b8e2a38dd5 100644
--- a/browser/components/shell/test/browser_setDesktopBackgroundPreview.js
+++ b/browser/components/shell/test/browser_setDesktopBackgroundPreview.js
@@ -12,7 +12,7 @@ add_task(async function () {
       gBrowser,
       url: "about:logo",
     },
-    async browser => {
+    async () => {
       const dialogLoad = BrowserTestUtils.domWindowOpened(null, async win => {
         await BrowserTestUtils.waitForEvent(win, "load");
         Assert.equal(
diff --git a/browser/components/shell/test/head.js b/browser/components/shell/test/head.js
index db1f8811fd..692ba918d0 100644
--- a/browser/components/shell/test/head.js
+++ b/browser/components/shell/test/head.js
@@ -89,7 +89,7 @@ async function testWindowSizePositive(width, height) {
   }
 
   let data = await IOUtils.read(screenshotPath);
-  await new Promise((resolve, reject) => {
+  await new Promise(resolve => {
     let blob = new Blob([data], { type: "image/png" });
     let reader = new FileReader();
     reader.onloadend = function () {
@@ -126,7 +126,7 @@ async function testGreen(url, path) {
   }
 
   let data = await IOUtils.read(path);
-  let image = await new Promise((resolve, reject) => {
+  let image = await new Promise(resolve => {
     let blob = new Blob([data], { type: "image/png" });
     let reader = new FileReader();
     reader.onloadend = function () {