Courier -> Courier Prime

CourierNewPrime.user.css

/* ==UserStyle==
@name        Courier font replacement
@namespace   vivelin.net
@version     1.0.2
@description Replace Courier and similar fonts with Courier Prime. Requires Courier Prime to be installed locally. Available from <https://quoteunquoteapps.com/courierprime/>.
@author      Vivelin
@updateURL   https://gist.githubusercontent.com/Vivelin/7b73bde9d62fb99741eab4e16de38eb6/raw/CourierNewPrime.user.css
@license     unlicense
==/UserStyle== */

@font-face { font-family: 'Courier'; src: local('Courier Prime'); }
@font-face { font-family: 'Courier New'; src: local('Courier Prime'); }