System Font Replacer user style

system-font-replacer.user.css

/* ==UserStyle==
@name           System Font Replacer
@namespace      vivelin.net
@version        1.0.3
@description    Overrides sites using system fonts to use your own configured font preferences, especially for user-generated content.
@author         Vivelin
@updateURL      https://gist.githubusercontent.com/Vivelin/0f7a88e322c7608296c4d6cc254d3316/raw/system-font-replacer.user.css
==/UserStyle== */
/*
 * Motivation: a lot of websites use boring or ugly system fonts, which 
 * is especially noticable for user-generated content on sites like
 * Wikipedia. Most people using custom user styles probably have their
 * font preferences configured already, so this style just overrides
 * certain sites to use those configured fonts.
 */
@-moz-document domain("github.com") {
  /* READMEs, comments, etc. */
  .markdown-body {
    font-family: sans-serif, 'Segoe UI Emoji';
  }

  /* Code blocks and inline code */
  tt,
  code,
  samp,
  pre,
  .blob-code-inner {
    font-family: monospace, 'Segoe UI Emoji';
  }
}

@-moz-document domain("stackexchange.com"),
domain("stackoverflow.com"),
domain("superuser.com") {
  html,
  body {
    --ff-sans: sans-serif, 'Segoe UI Emoji';
    --ff-serif: serif, 'Segoe UI Emoji';
    --ff-mono: monospace, 'Segoe UI Emoji';
  }
}

@-moz-document domain("dev.to") {
  html,
  body {
    --ff-sans-serif: sans-serif, 'Segoe UI Emoji';
    --ff-serif: serif, 'Segoe UI Emoji';
    --ff-monospace: monospace, 'Segoe UI Emoji';
  }
}

@-moz-document domain("5e.tools") {
  body,
  .stats--book {
    font-family: sans-serif, 'Segoe UI Emoji';
  }

  .stats--book p {
    font-family: serif, 'Segoe UI Emoji';
    font-size: 1.2em;
  }
}

@-moz-document domain("gamefaqs.gamespot.com") {
  body {
    font-family: sans-serif, 'Segoe UI Emoji';
  }
}

@-moz-document domain("dev.azure.com") {
  .monospaced-text {
    font-family: monospace, 'Segoe UI Emoji';
  }
}

@-moz-document domain("wiki.guildwars2.com") {
  div#globalWrapper, 
  input, 
  select, 
  h3, 
  #bodyContent > h3 {
    font-family: sans-serif, 'Segoe UI Emoji';
  }
}

@-moz-document domain("reddit.com") {
  ._292iotee39Lmt0MkQZ2hPV {
    font-family: sans-serif, 'Segoe UI Emoji';
  }
}

@-moz-document domain("google.com") {
  .std, .g, .MBeuO, .e9EfHf, .gsfi, .lst, .GLcBOb {
    font-family: sans-serif, 'Segoe UI Emoji';
  }
}

@-moz-document domain("dndbeyond.com") {
  body {
    font-family: sans-serif, 'Segoe UI Emoji';
  }
}

@-moz-document domain("fandom.com") {  
  .page .mw-parser-output > :is(p, ul) {
    font-family: serif, serif, 'Segoe UI Emoji';
    font-size: 1.125rem;
  }
}

@-moz-document domain("www.nu.nl") {
  :root { 
    --primary-font-family: serif;
  }
}

@-moz-document domain("learn.microsoft.com") {
  code {
    font-family: monospace;
  }
  
  .hljs-comment {
    font-style: italic;
  }
}