diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 1fa8f216..1ccc1bda 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -952,6 +952,18 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
                     loc = { url: loc[0], postData: loc[1] };
                 else if (isString(loc))
                     loc = { url: loc };
+                else
+                    loc = Object.create(loc);
+
+                if (isString(loc.postData))
+                    loc.postData = ["application/x-www-form-urlencoded", loc.postData];
+
+                if (isArray(loc.postData)) {
+                    let stream = services.MIMEStream(services.StringStream(loc.postData[1]));
+                    stream.addHeader("Content-Type", loc.postData[0]);
+                    stream.addContentLength = true;
+                    loc.postData = stream;
+                }
 
                 // decide where to load the first url
                 switch (where) {
diff --git a/common/modules/services.jsm b/common/modules/services.jsm
index d47da247..bf8db8c2 100644
--- a/common/modules/services.jsm
+++ b/common/modules/services.jsm
@@ -92,6 +92,7 @@ var Services = Module("Services", {
         this.addClass("HtmlEncoder",  "@mozilla.org/layout/htmlCopyEncoder;1",     "nsIDocumentEncoder");
         this.addClass("InterfacePointer", "@mozilla.org/supports-interface-pointer;1", "nsISupportsInterfacePointer", "data");
         this.addClass("InputStream",  "@mozilla.org/scriptableinputstream;1",      "nsIScriptableInputStream", "init");
+        this.addClass("MIMEStream",   "@mozilla.org/network/mime-input-stream;1",  "nsIMIMEInputStream", "setData");
         this.addClass("Persist",      "@mozilla.org/embedding/browser/nsWebBrowserPersist;1", "nsIWebBrowserPersist");
         this.addClass("Pipe",         "@mozilla.org/pipe;1",                       "nsIPipe", "init");
         this.addClass("Process",      "@mozilla.org/process/util;1",               "nsIProcess", "init");