stdin.diff

diff --git a/browser/components/extensions/test/browser/browser_ext_user_events.js b/browser/components/extensions/test/browser/browser_ext_user_events.js
--- a/browser/components/extensions/test/browser/browser_ext_user_events.js
+++ b/browser/components/extensions/test/browser/browser_ext_user_events.js
@@ -144,17 +144,17 @@ add_task(async function testSources() {
 
   clickBrowserAction(extension);
   await check("browser action click");
 
   promisePopupNotificationShown("addon-webext-permissions").then(panel => {
     panel.button.click();
   });
 
-  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+  await BrowserTestUtils.openNewForegroundTab(gBrowser);
 
   let menu = await openContextMenu("body");
   let items = menu.getElementsByAttribute("label", "test user events");
   is(items.length, 1, "Found context menu item");
   EventUtils.synthesizeMouseAtCenter(items[0], {});
   await check("context menu click");
 
   extension.sendMessage("openOptionsPage");