diff --git a/lib/$.coffee b/lib/$.coffee
index 59e08cbbd..306eba722 100644
--- a/lib/$.coffee
+++ b/lib/$.coffee
@@ -36,23 +36,15 @@ $.extend = (object, properties) ->
   for key, val of properties
     object[key] = val
   return
-$.ajax = (url, callbacks, opts={}) ->
-  {type, cred, headers, upCallbacks, form, sync} = opts
+$.ajax = (url, options, extra={}) ->
+  {type, headers, upCallbacks, form, sync} = extra
   r = new XMLHttpRequest()
   type or= form and 'post' or 'get'
   r.open type, url, !sync
   for key, val of headers
     r.setRequestHeader key, val
-  $.extend r, callbacks
+  $.extend r, options
   $.extend r.upload, upCallbacks
-  try
-    # Firefox throws an error if you try
-    # to set this on a synchronous XHR.
-    # Only cookies from the remote domain
-    # are used in a request withCredentials.
-    r.withCredentials = cred
-  catch err
-    # do nothing
   r.send form
   r
 $.cache = do ->
diff --git a/src/General/Main.coffee b/src/General/Main.coffee
index 0105d43f6..a1dd45ae4 100644
--- a/src/General/Main.coffee
+++ b/src/General/Main.coffee
@@ -345,7 +345,7 @@ Main =
       <% } %>
     ).join '\n'
     return unless errors
-    $.ajax '<%= meta.page %>errors', {},
+    $.ajax '<%= meta.page %>errors', null,
       sync: true
       form: $.formData
         n: "<%= meta.name %> v#{g.VERSION}"
diff --git a/src/Menu/DeleteLink.coffee b/src/Menu/DeleteLink.coffee
index 7f71d7f6e..b7678e48a 100644
--- a/src/Menu/DeleteLink.coffee
+++ b/src/Menu/DeleteLink.coffee
@@ -55,10 +55,10 @@ DeleteLink =
 
     link = @
     $.ajax $.id('delform').action.replace("/#{g.BOARD}/", "/#{post.board}/"),
+      withCredentials: true
       onload:  -> DeleteLink.load  link, post, fileOnly, @response
       onerror: -> DeleteLink.error link
     ,
-      cred: true
       form: $.formData form
   load: (link, post, fileOnly, html) ->
     tmpDoc = d.implementation.createHTMLDocument ''
diff --git a/src/Posting/QR.coffee b/src/Posting/QR.coffee
index 791e7ded0..6a1d339d9 100644
--- a/src/Posting/QR.coffee
+++ b/src/Posting/QR.coffee
@@ -959,7 +959,8 @@ QR =
       recaptcha_challenge_field: challenge
       recaptcha_response_field:  response
 
-    callbacks =
+    options =
+      withCredentials: true
       onload: QR.response
       onerror: ->
         # Connection error, or
@@ -973,8 +974,7 @@ QR =
           Connection error. You may have been <a href=//www.4chan.org/banned target=_blank>banned</a>.
           [<a href="https://github.com/MayhemYDG/4chan-x/wiki/FAQ#what-does-connection-error-you-may-have-been-banned-mean" target=_blank>FAQ</a>]
           """
-    opts =
-      cred: true
+    extra =
       form: $.formData postData
       upCallbacks:
         onload: ->
@@ -988,7 +988,7 @@ QR =
           QR.req.progress = "#{Math.round e.loaded / e.total * 100}%"
           QR.status()
 
-    QR.req = $.ajax $.id('postForm').parentNode.action, callbacks, opts
+    QR.req = $.ajax $.id('postForm').parentNode.action, options, extra
     # Starting to upload might take some time.
     # Provide some feedback that we're starting to submit.
     QR.req.uploadStartTime = Date.now()