diff --git a/app/scripts/fetch_xulrunner b/app/scripts/fetch_xulrunner
index b147d68417..f2dc38428a 100755
--- a/app/scripts/fetch_xulrunner
+++ b/app/scripts/fetch_xulrunner
@@ -126,6 +126,9 @@ function modify_omni {
     }
     if (!updateAuto) {' modules/UpdateService.jsm
 	
+	# Avoid console warning about resource://gre/modules/FxAccountsCommon.js
+	replace_line 'const logins = this._data.logins;' 'const logins = this._data.logins; if (this._data.logins.length == -1) return;' modules/LoginStore.jsm
+	
 	# Prevent error during network requests
 	replace_line 'async lazyInit\(\) \{' 'async lazyInit() { if (this.features) return false;' modules/UrlClassifierExceptionListService.jsm