.config/firefox/userContent.css


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/* To enable:
 * - set toolkit.legacyUserProfileCustomizations.stylesheets
 * - move this file to $profiledir/chrome
 *
 * References:
 * https://web.archive.org/web/20211023121642/https://kb.mozillazine.org/UserContent.css
 * https://developer.mozilla.org/en-US/docs/Web/CSS/@document
 */

@-moz-document domain(danluu.com) {
    body {
        max-width: 40em;
        margin: auto;
    }
}

@-moz-document domain(martinfowler.com) {
    body {
        max-width: fit-content;
        margin: auto !important;
    }
}