I've never seen ads in the address bar and when I checked the about:config for those two items they were both false. I installed it from the Pop OS! repository.
As far as I can tell, they do not. I believe (correct me if I'm wrong) that their Firefox package is just taken directly from Ubuntu, and they only apply a single theming option on top of that: https://github.com/pop-os/default-settings/blob/master_focal...