Phil Hughes
--- a/app/assets/javascripts/blob/notebook/index.js
+++ b/app/assets/javascripts/blob/notebook/index.js
-      }).appendTo('head');
+      if (gon.katex_css_url) {
+        const katexStyles = document.createElement('link');
+        katexStyles.setAttribute('rel', 'stylesheet');
+        katexStyles.setAttribute('href', gon.katex_css_url);
+        document.head.appendChild(katexStyles);
+      }

      if (gon.katex_js_url) {
-        $.getScript(gon.katex_js_url, () => {
+        const katexScript = document.createElement('script');
+        katexScript.addEventListener('load', () => {
          this.loadFile();
        });
+        katexScript.setAttribute('src', gon.katex_js_url);
+        document.head.appendChild(katexScript);