diff --git a/jslib b/jslib
index 00f1aad65ea..3238b819268 160000
--- a/jslib
+++ b/jslib
@@ -1 +1 @@
-Subproject commit 00f1aad65ea2e243713d409873dfb5d833296897
+Subproject commit 3238b819268d2155376a22b963887f59a3eeb7ca
diff --git a/src/background/idle.background.ts b/src/background/idle.background.ts
index 1be8fca7f63..ac6dd82a567 100644
--- a/src/background/idle.background.ts
+++ b/src/background/idle.background.ts
@@ -15,7 +15,7 @@ export default class IdleBackground {
 
     constructor(private lockService: LockService, private storageService: StorageService,
         private notificationsService: NotificationsService) {
-        this.idle = chrome.idle || (browser && browser.idle);
+        this.idle = chrome.idle || (browser != null ? browser.idle : null);
     }
 
     async init() {