1 files changed, 1 insertions, 1 deletions
diff --git a/browser/base/content/test/webextensions/browser_update_checkForUpdates.js b/browser/base/content/test/webextensions/browser_update_checkForUpdates.js
index b902527cae..c9e59556e1 100644
--- a/browser/base/content/test/webextensions/browser_update_checkForUpdates.js
+++ b/browser/base/content/test/webextensions/browser_update_checkForUpdates.js
@@ -3,7 +3,7 @@ function checkAll(win) {
   triggerPageOptionsAction(win, "check-for-updates");
   return new Promise(resolve => {
     let observer = {
-      observe(subject, topic, data) {
+      observe() {
         Services.obs.removeObserver(observer, "EM-update-check-finished");
         resolve();
       },