we already set these ```js pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false); pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false); ``` but left the UI hanging out there (`about:preferences` > `General` > `Browsing`)  cc @henry @donuts edit: we already do this for MB .. so we should just move that code to base browser