Actually, I don't need to remove it to not support it.

src/config.coffee

@@ -9,6 +9,10 @@ Config =
         false
         'Link to external catalog instead of the internal one.'
       ]
+      'Enable 4chan\'s Extension': [
+        false
+        'Compatibility between <%= meta.name %> and 4chan\'s inline extension is NOT guaranteed.'
+      ]
       'Custom Board Navigation': [
         true
         'Show custom links instead of the full board list.'

src/css/style.css

@@ -194,8 +194,8 @@ a[href="javascript:;"] {
 .expand-all-shortcut {
   opacity: .45;
 }
-#navtopright a {
-  text-decoration: none;
+#navtopright {
+  display: none;
 }
 
 /* Notifications */

src/features/misc/expandthread.coffee

@@ -94,5 +94,8 @@ ExpandThread =
     Main.callbackNodes Post, posts
     $.after a, nodes
 
-    # 4chan features.
-    Fourchan.parseThread thread.ID, 1, nodes.length
+    # Enable 4chan features.
+    if Conf['Enable 4chan\'s Extension']
+      $.globalEval "Parser.parseThread(#{thread.ID}, 1, #{nodes.length})"
+    else
+      Fourchan.parseThread thread.ID, 1, nodes.length

src/features/misc/header.coffee

@@ -55,6 +55,9 @@ Header =
 
   toggle: $.el 'div',
     id: 'toggle-header-bar'
+  
+  settings: $.el 'div',
+    id: 'settingsContainer'
 
   createSubEntry: (setting)->
     label = $.el 'label',
@@ -71,10 +74,6 @@ Header =
 
     fullBoardList = $.el 'span',
       id:     'full-board-list'
-      hidden: true
-
-    customBoardList = $.el 'span',
-      id:     'custom-board-list'
 
     Header.setBarPosition.call textContent: "#{Conf['Boards Navigation']}"
     $.sync 'Boards Navigation', Header.changeBarPosition
@@ -82,21 +81,26 @@ Header =
     Header.setBarVisibility Conf['Header auto-hide']
     $.sync 'Header auto-hide',  Header.setBarVisibility
 
-    settings = $.id 'navtopright'
-
     $.add fullBoardList, [nav.childNodes...]
-    $.add nav, [Header.menuButton, customBoardList, fullBoardList, Header.shortcuts, Header.bar, Header.toggle, settings]
+    $.add nav, [Header.menuButton, fullBoardList, Header.shortcuts, Header.bar, Header.toggle, Header.settings]
 
     if Conf['Custom Board Navigation']
+      fullBoardList.hidden = true
+      customBoardList = $.el 'span',
+        id:     'custom-board-list'
+
       Header.generateBoardList Conf['boardnav']
       $.sync 'boardnav', Header.generateBoardList
+
       btn = $.el 'span',
         className: 'hide-board-list-button'
         innerHTML: '[<a href=javascript:;> - </a>]\u00A0'
       $.on btn, 'click', Header.toggleBoardList
+
       $.prepend fullBoardList, btn
+      $.before fullBoardList, customBoardList
+
     else
-      $.rm $ '#custom-board-list', nav
       fullBoardList.hidden = false
 
   generateBoardList: (text) ->

src/features/monitoring/threadupdater.coffee

@@ -289,7 +289,10 @@ ThreadUpdater =
         # Enable 4chan features.
         threadID = ThreadUpdater.thread.ID
         {length} = $$ '.thread > .postContainer', ThreadUpdater.root
-        Fourchan.parseThread threadID, length - count, length
+        if Conf['Enable 4chan\'s Extension']
+          $.globalEval "Parser.parseThread(#{threadID}, #{-count})"
+        else
+          Fourchan.parseThread threadID, length - count, length
 
     $.event 'ThreadUpdate',
       404: false

src/settings.coffee

@@ -7,12 +7,7 @@ Settings =
       href:        'javascript:;'
     $.on link, 'click', Settings.open
 
-    $.asap (-> d.body), ->
-      return unless Main.isThisPageLegit()
-      # Wait for #boardNavMobile instead of #boardNavDesktop,
-      # it might be incomplete otherwise.
-      $.asap (-> $.id 'boardNavMobile'), ->
-        $.replace $.id('settingsWindowLink'), link
+    $.add Header.settings, [$.tn(' ['), link, $.tn('] ')]
 
     $.get 'previousversion', null, (item) ->
       if previous = item['previousversion']
@@ -40,6 +35,7 @@ Settings =
     $.on d, 'AddSettingsSection',   Settings.addSection
     $.on d, 'OpenSettings',         (e) -> Settings.open e.detail
 
+    return if Conf['Enable 4chan\'s Extension']
     settings = JSON.parse(localStorage.getItem '4chan-settings') or {}
     return if settings.disableAll
     settings.disableAll = true