diff --git a/toolkit/components/passwordmgr/test/browser/browser_passwordmgr_sort.js b/toolkit/components/passwordmgr/test/browser/browser_passwordmgr_sort.js
index 60e2b7ef97a..e774f39c44b 100644
--- a/toolkit/components/passwordmgr/test/browser/browser_passwordmgr_sort.js
+++ b/toolkit/components/passwordmgr/test/browser/browser_passwordmgr_sort.js
@@ -88,7 +88,7 @@ function test() {
 
             Services.obs.addObserver(function (aSubject, aTopic, aData) {
                 if (aTopic == "passwordmgr-password-toggle-complete") {
-                    Services.obs.removeObserver(arguments.callee, aTopic, false);
+                    Services.obs.removeObserver(arguments.callee, aTopic);
                     func();
                 }
             }, "passwordmgr-password-toggle-complete", false);
diff --git a/toolkit/components/passwordmgr/test/browser/browser_passwordmgrdlg.js b/toolkit/components/passwordmgr/test/browser/browser_passwordmgrdlg.js
index d2643a9b854..fd49507e485 100644
--- a/toolkit/components/passwordmgr/test/browser/browser_passwordmgrdlg.js
+++ b/toolkit/components/passwordmgr/test/browser/browser_passwordmgrdlg.js
@@ -99,7 +99,7 @@ function test() {
 
             Services.obs.addObserver(function (aSubject, aTopic, aData) {
                 if (aTopic == "passwordmgr-password-toggle-complete") {
-                    Services.obs.removeObserver(arguments.callee, aTopic, false);
+                    Services.obs.removeObserver(arguments.callee, aTopic);
                     func();
                 }
             }, "passwordmgr-password-toggle-complete", false);
diff --git a/toolkit/components/social/MozSocialAPI.jsm b/toolkit/components/social/MozSocialAPI.jsm
index bb1f7ca4dc5..3c27d175227 100644
--- a/toolkit/components/social/MozSocialAPI.jsm
+++ b/toolkit/components/social/MozSocialAPI.jsm
@@ -31,7 +31,7 @@ this.MozSocialAPI = {
       }
 
     } else {
-      Services.obs.removeObserver(injectController, "document-element-inserted", false);
+      Services.obs.removeObserver(injectController, "document-element-inserted");
     }
   }
 };
diff --git a/toolkit/components/social/test/browser/browser_workerAPI.js b/toolkit/components/social/test/browser/browser_workerAPI.js
index bf214e85db9..daa5979a61a 100644
--- a/toolkit/components/social/test/browser/browser_workerAPI.js
+++ b/toolkit/components/social/test/browser/browser_workerAPI.js
@@ -36,7 +36,7 @@ let tests = {
       profileURL: "http://en.wikipedia.org/wiki/Kuma_Lisa"
     }
     function ob(aSubject, aTopic, aData) {
-      Services.obs.removeObserver(ob, "social:profile-changed", false);
+      Services.obs.removeObserver(ob, "social:profile-changed");
       is(aData, provider.origin, "update of profile from our provider");
       let profile = provider.profile;
       is(profile.portrait, expect.portrait, "portrait is set");
@@ -56,7 +56,7 @@ let tests = {
       name: "test-ambient"
     }
     function ob(aSubject, aTopic, aData) {
-      Services.obs.removeObserver(ob, "social:ambient-notification-changed", false);
+      Services.obs.removeObserver(ob, "social:ambient-notification-changed");
       is(aData, provider.origin, "update is from our provider");
       let notif = provider.ambientNotificationIcons[expect.name];
       is(notif.name, expect.name, "ambientNotification reflected");
@@ -74,7 +74,7 @@ let tests = {
       userName: ""
     };
     function ob(aSubject, aTopic, aData) {
-      Services.obs.removeObserver(ob, "social:profile-changed", false);
+      Services.obs.removeObserver(ob, "social:profile-changed");
       is(aData, provider.origin, "update of profile from our provider");
       is(Object.keys(provider.profile).length, 0, "profile was cleared by empty username");
       is(Object.keys(provider.ambientNotificationIcons).length, 0, "icons were cleared by empty username");