1 files changed, 1 insertions, 1 deletions
diff --git a/testing/talos/talos/tests/cpstartup/extension/api.js b/testing/talos/talos/tests/cpstartup/extension/api.js
index 8b5e7438ce..7a881ef66f 100644
--- a/testing/talos/talos/tests/cpstartup/extension/api.js
+++ b/testing/talos/talos/tests/cpstartup/extension/api.js
@@ -116,7 +116,7 @@ this.cpstartup = class extends ExtensionAPI {
   removeTab(tab) {
     return new Promise(resolve => {
       let browser = tab.linkedBrowser;
-      let observer = (subject, topic, data) => {
+      let observer = subject => {
         if (subject === browser) {
           Services.obs.removeObserver(observer, BROWSER_FLUSH_TOPIC);
           resolve();