diff --git a/javascript/firefox-driver/webdriver.json b/javascript/firefox-driver/webdriver.json
index 1b879eb2d094e..f1d405e4bd595 100644
--- a/javascript/firefox-driver/webdriver.json
+++ b/javascript/firefox-driver/webdriver.json
@@ -57,6 +57,7 @@
   },
   "mutable": {
     "browser.dom.window.dump.enabled": true,
+    "browser.laterrun.enabled": false,
     "browser.newtab.url": "about:blank",
     "browser.newtabpage.enabled": false,
     "browser.startup.page": 0,