1 files changed, 1 insertions, 1 deletions
diff --git a/toolkit/mozapps/extensions/test/browser/browser_page_options_install_addon.js b/toolkit/mozapps/extensions/test/browser/browser_page_options_install_addon.js
index 7bc7c08345..586f2b7720 100644
--- a/toolkit/mozapps/extensions/test/browser/browser_page_options_install_addon.js
+++ b/toolkit/mozapps/extensions/test/browser/browser_page_options_install_addon.js
@@ -10,7 +10,7 @@ MockFilePicker.init(window.browsingContext);
 async function checkInstallConfirmation(...names) {
   let notificationCount = 0;
   let observer = {
-    observe(aSubject, aTopic, aData) {
+    observe(aSubject) {
       var installInfo = aSubject.wrappedJSObject;
       isnot(
         installInfo.browser,