diff --git a/dlls/mshtml/mshtml_private.h b/dlls/mshtml/mshtml_private.h
index 019f66f1603..827b8129ed6 100644
--- a/dlls/mshtml/mshtml_private.h
+++ b/dlls/mshtml/mshtml_private.h
@@ -437,6 +437,7 @@ struct NSContainer {
 typedef struct nsWineURI nsWineURI;
 
 HRESULT set_wine_url(nsWineURI*,LPCWSTR);
+nsresult on_start_uri_open(NSContainer*,nsIURI*,PRBool*);
 
 typedef struct {
     const nsIHttpChannelVtbl *lpHttpChannelVtbl;
diff --git a/dlls/mshtml/nsembed.c b/dlls/mshtml/nsembed.c
index 3415657fbcb..fa8aa41fedf 100644
--- a/dlls/mshtml/nsembed.c
+++ b/dlls/mshtml/nsembed.c
@@ -1124,41 +1124,12 @@ static nsrefcnt NSAPI nsURIContentListener_Release(nsIURIContentListener *iface)
     return nsIWebBrowserChrome_Release(NSWBCHROME(This));
 }
 
-static BOOL translate_url(HTMLDocumentObj *doc, nsIWineURI *nsuri)
-{
-    OLECHAR *new_url = NULL, *url;
-    BOOL ret = FALSE;
-    LPCWSTR wine_url;
-    HRESULT hres;
-
-    if(!doc->hostui)
-        return FALSE;
-
-    nsIWineURI_GetWineURL(nsuri, &wine_url);
-
-    url = heap_strdupW(wine_url);
-    hres = IDocHostUIHandler_TranslateUrl(doc->hostui, 0, url, &new_url);
-    heap_free(url);
-    if(hres != S_OK || !new_url)
-        return FALSE;
-
-    if(strcmpW(url, new_url)) {
-        FIXME("TranslateUrl returned new URL %s -> %s\n", debugstr_w(url), debugstr_w(new_url));
-        ret = TRUE;
-    }
-
-    CoTaskMemFree(new_url);
-    return ret;
-}
-
 static nsresult NSAPI nsURIContentListener_OnStartURIOpen(nsIURIContentListener *iface,
                                                           nsIURI *aURI, PRBool *_retval)
 {
     NSContainer *This = NSURICL_THIS(iface);
-    nsIWineURI *wine_uri;
     nsACString spec_str;
     const char *spec;
-    BOOL is_doc_uri;
     nsresult nsres;
 
     nsACString_Init(&spec_str, NULL);
@@ -1169,22 +1140,9 @@ static nsresult NSAPI nsURIContentListener_OnStartURIOpen(nsIURIContentListener
 
     nsACString_Finish(&spec_str);
 
-    nsres = nsIURI_QueryInterface(aURI, &IID_nsIWineURI, (void**)&wine_uri);
-    if(NS_FAILED(nsres)) {
-        WARN("Could not get nsIWineURI interface: %08x\n", nsres);
-        return NS_ERROR_NOT_IMPLEMENTED;
-    }
-
-    nsIWineURI_GetIsDocumentURI(wine_uri, &is_doc_uri);
-
-    if(!is_doc_uri) {
-        nsIWineURI_SetNSContainer(wine_uri, This);
-        nsIWineURI_SetIsDocumentURI(wine_uri, TRUE);
-
-        *_retval = translate_url(This->doc->basedoc.doc_obj, wine_uri);
-    }
-
-    nsIWineURI_Release(wine_uri);
+    nsres = on_start_uri_open(This, aURI, _retval);
+    if(NS_FAILED(nsres))
+        return nsres;
 
     return !*_retval && This->content_listener
         ? nsIURIContentListener_OnStartURIOpen(This->content_listener, aURI, _retval)
diff --git a/dlls/mshtml/nsio.c b/dlls/mshtml/nsio.c
index b9e1e6090b0..c2866736648 100644
--- a/dlls/mshtml/nsio.c
+++ b/dlls/mshtml/nsio.c
@@ -150,6 +150,56 @@ static BOOL before_async_open(nsChannel *channel, NSContainer *container)
     return hres != S_OK;
 }
 
+static BOOL translate_url(HTMLDocumentObj *doc, nsWineURI *uri)
+{
+    OLECHAR *new_url = NULL, *url;
+    BOOL ret = FALSE;
+    HRESULT hres;
+
+    if(!doc->hostui)
+        return FALSE;
+
+    url = heap_strdupW(uri->wine_url);
+    hres = IDocHostUIHandler_TranslateUrl(doc->hostui, 0, url, &new_url);
+    heap_free(url);
+    if(hres != S_OK || !new_url)
+        return FALSE;
+
+    if(strcmpW(url, new_url)) {
+        FIXME("TranslateUrl returned new URL %s -> %s\n", debugstr_w(url), debugstr_w(new_url));
+        ret = TRUE;
+    }
+
+    CoTaskMemFree(new_url);
+    return ret;
+}
+
+nsresult on_start_uri_open(NSContainer *nscontainer, nsIURI *uri, PRBool *_retval)
+{
+    nsWineURI *wine_uri;
+    nsresult nsres;
+
+    *_retval = FALSE;
+
+    nsres = nsIURI_QueryInterface(uri, &IID_nsIWineURI, (void**)&wine_uri);
+    if(NS_FAILED(nsres)) {
+        WARN("Could not get nsWineURI: %08x\n", nsres);
+        return NS_ERROR_NOT_IMPLEMENTED;
+    }
+
+    if(!wine_uri->is_doc_uri) {
+        if(!wine_uri->container) {
+            nsIWebBrowserChrome_AddRef(NSWBCHROME(nscontainer));
+            wine_uri->container = nscontainer;
+        }
+
+        wine_uri->is_doc_uri = TRUE;
+        *_retval = translate_url(nscontainer->doc->basedoc.doc_obj, wine_uri);
+    }
+
+    nsIURI_Release(NSURI(wine_uri));
+    return NS_OK;
+}
 HRESULT set_wine_url(nsWineURI *This, LPCWSTR url)
 {
     nsIWineURI_SetWineURL(NSWINEURI(This), url);