// ==UserScript==
// @name       GitHub Monospace Editor
// @namespace  http://xoul.kr/github-monospace-editor
// @version    0.1.1
// @description  GitHub Monospace Editor
// @match      github.com/*/*/*
// @copyright  2014, devxoul
// ==/UserScript==

$(document.head).append($('<style>#pull_request_body, #new_comment_field { font-family: monospace; }</style>'));

@@ -251,83 +251,137 @@
 ==%0A%0A
-$(document.head).append($('%3Cstyle%3E#pull_request_body, #new_comment_field %7B 
+(function() %7B%0A  $(document).on('pjax:success', monospace);%0A  function monospace() %7B%0A    var css = '%3Cstyle%3E.comment-form-textarea%7B
 font
@@ -399,17 +399,16 @@
 nospace;
- 
 %7D%3C/style
@@ -409,12 +409,71 @@
 /style%3E'
-)
+%0A    $(document.head).append($(css));%0A  %7D%0A  monospace();%0A%7D)(
 );%0A

Add Pjax support.