http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2021/01/13/How-to-properly-install-Windows.html
Firefox and Thunderbird - for these, I copy a saved profile that is void of any data except my customizations (custom CSS, add-ons etc). For Firefox, I recommend installing addons live when the user account gets set up on the target computer, as this seams more reliable of a method.