diff --git a/4chan_x.user.js b/4chan_x.user.js
index 763518aa8..644a451a1 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -311,6 +311,19 @@
     id: function(id) {
       return d.getElementById(id);
     },
+    formData: function(arg) {
+      var fd, key, val;
+      if (arg instanceof HTMLFormElement) {
+        fd = new FormData(arg);
+      } else {
+        fd = new FormData();
+        for (key in arg) {
+          val = arg[key];
+          fd.append(key, val);
+        }
+      }
+      return fd;
+    },
     ajax: function(url, callbacks, opts) {
       var form, headers, key, r, type, upCallbacks, val;
       if (opts == null) {
@@ -318,18 +331,15 @@
       }
       type = opts.type, headers = opts.headers, upCallbacks = opts.upCallbacks, form = opts.form;
       r = new XMLHttpRequest();
-      r.open(type || 'get', url, true);
+      type || (type = form && 'post' || 'get');
+      r.open(type, url, true);
       for (key in headers) {
         val = headers[key];
         r.setRequestHeader(key, val);
       }
       $.extend(r, callbacks);
       $.extend(r.upload, upCallbacks);
-      if (typeof form === 'string') {
-        r.sendAsBinary(form);
-      } else {
-        r.send(form);
-      }
+      r.send(form);
       return r;
     },
     cache: function(url, cb) {
@@ -1976,7 +1986,7 @@
       return QR.el.dispatchEvent(e);
     },
     submit: function(e) {
-      var callbacks, captcha, captchas, challenge, err, form, m, name, opts, post, reply, response, threadID, val;
+      var callbacks, captcha, captchas, challenge, err, m, opts, post, reply, response, threadID;
       if (e != null) {
         e.preventDefault();
       }
@@ -2043,13 +2053,6 @@
         recaptcha_challenge_field: challenge,
         recaptcha_response_field: response + ' '
       };
-      form = new FormData();
-      for (name in post) {
-        val = post[name];
-        if (val) {
-          form.append(name, val);
-        }
-      }
       callbacks = {
         onload: function() {
           return QR.response(this.response);
@@ -2064,8 +2067,7 @@
         }
       };
       opts = {
-        form: form,
-        type: 'POST',
+        form: $.formData(post),
         upCallbacks: {
           onload: function() {
             return QR.status({
diff --git a/script.coffee b/script.coffee
index 70570a838..c847e28c6 100644
--- a/script.coffee
+++ b/script.coffee
@@ -266,15 +266,24 @@ $.extend $,
       cb JSON.parse e.newValue if e.key is "#{Main.namespace}#{key}"
   id: (id) ->
     d.getElementById id
+  formData: (arg) ->
+    if arg instanceof HTMLFormElement
+      fd = new FormData arg
+    else
+      fd = new FormData()
+      for key, val of arg
+        fd.append key, val
+    fd
   ajax: (url, callbacks, opts={}) ->
     {type, headers, upCallbacks, form} = opts
     r = new XMLHttpRequest()
-    r.open type or 'get', url, true
+    type or= form and 'post' or 'get'
+    r.open type, url, true
     for key, val of headers
       r.setRequestHeader key, val
     $.extend r, callbacks
     $.extend r.upload, upCallbacks
-    if typeof form is 'string' then r.sendAsBinary form else r.send form
+    r.send form
     r
   cache: (url, cb) ->
     if req = $.cache.requests[url]
@@ -1547,10 +1556,6 @@ QR =
       recaptcha_challenge_field: challenge
       recaptcha_response_field:  response + ' '
 
-    form = new FormData()
-    for name, val of post
-      form.append name, val if val
-
     callbacks =
       onload: ->
         QR.response @response
@@ -1563,8 +1568,7 @@ QR =
           target: '_blank'
           textContent: 'Connection error, or you are banned.'
     opts =
-      form: form
-      type: 'POST'
+      form: $.formData post
       upCallbacks:
         onload: ->
           # Upload done, waiting for response.