diff --git a/extensions/cookie/nsCookiePermission.cpp b/extensions/cookie/nsCookiePermission.cpp
index befa81a03ed3..c5902ac4f928 100644
--- a/extensions/cookie/nsCookiePermission.cpp
+++ b/extensions/cookie/nsCookiePermission.cpp
@@ -358,104 +358,6 @@ nsCookiePermission::CanSetCookie(nsIURI     *aURI,
   return NS_OK;
 }
 
-NS_IMETHODIMP 
-nsCookiePermission::GetOriginatingURI(nsIChannel  *aChannel,
-                                      nsIURI     **aURI)
-{
-  /* to find the originating URI, we use the loadgroup of the channel to obtain
-   * the window owning the load, and from there, we find the top same-type
-   * window and its URI. there are several possible cases:
-   *
-   * 1) no channel.
-   *
-   * 2) a channel with the "force allow third party cookies" option set.
-   *    since we may not have a window, we return the channel URI in this case.
-   *
-   * 3) a channel, but no window. this can occur when the consumer kicking
-   *    off the load doesn't provide one to the channel, and should be limited
-   *    to loads of certain types of resources.
-   *
-   * 4) a window equal to the top window of same type, with the channel its
-   *    document channel. this covers the case of a freshly kicked-off load
-   *    (e.g. the user typing something in the location bar, or clicking on a
-   *    bookmark), where the window's URI hasn't yet been set, and will be
-   *    bogus. we return the channel URI in this case.
-   *
-   * 5) Anything else. this covers most cases for an ordinary page load from
-   *    the location bar, and will catch nested frames within a page, image
-   *    loads, etc. we return the URI of the root window's document's principal
-   *    in this case.
-   */
-
-  *aURI = nullptr;
-
-  // case 1)
-  if (!aChannel)
-    return NS_ERROR_NULL_POINTER;
-
-  // case 2)
-  nsCOMPtr<nsIHttpChannelInternal> httpChannelInternal = do_QueryInterface(aChannel);
-  if (httpChannelInternal)
-  {
-    bool doForce = false;
-    if (NS_SUCCEEDED(httpChannelInternal->GetForceAllowThirdPartyCookie(&doForce)) && doForce)
-    {
-      // return the channel's URI (we may not have a window)
-      aChannel->GetURI(aURI);
-      if (!*aURI)
-        return NS_ERROR_NULL_POINTER;
-
-      return NS_OK;
-    }
-  }
-
-  // find the associated window and its top window
-  nsCOMPtr<nsILoadContext> ctx;
-  NS_QueryNotificationCallbacks(aChannel, ctx);
-  nsCOMPtr<nsIDOMWindow> topWin, ourWin;
-  if (ctx) {
-    ctx->GetTopWindow(getter_AddRefs(topWin));
-    ctx->GetAssociatedWindow(getter_AddRefs(ourWin));
-  }
-
-  // case 3)
-  if (!topWin)
-    return NS_ERROR_INVALID_ARG;
-
-  // case 4)
-  if (ourWin == topWin) {
-    // Check whether this is the document channel for this window (representing
-    // a load of a new page).  This is a bit of a nasty hack, but we will
-    // hopefully flag these channels better later.
-    nsLoadFlags flags;
-    aChannel->GetLoadFlags(&flags);
-
-    if (flags & nsIChannel::LOAD_DOCUMENT_URI) {
-      // get the channel URI - the window's will be bogus
-      aChannel->GetURI(aURI);
-      if (!*aURI)
-        return NS_ERROR_NULL_POINTER;
-
-      return NS_OK;
-    }
-  }
-
-  // case 5) - get the originating URI from the top window's principal
-  nsCOMPtr<nsIScriptObjectPrincipal> scriptObjPrin = do_QueryInterface(topWin);
-  NS_ENSURE_TRUE(scriptObjPrin, NS_ERROR_UNEXPECTED);
-
-  nsIPrincipal* prin = scriptObjPrin->GetPrincipal();
-  NS_ENSURE_TRUE(prin, NS_ERROR_UNEXPECTED);
-  
-  prin->GetURI(aURI);
-
-  if (!*aURI)
-    return NS_ERROR_NULL_POINTER;
-
-  // all done!
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 nsCookiePermission::Observe(nsISupports     *aSubject,
                             const char      *aTopic,
diff --git a/netwerk/cookie/nsICookiePermission.idl b/netwerk/cookie/nsICookiePermission.idl
index 379695c917e7..9b5744f50139 100644
--- a/netwerk/cookie/nsICookiePermission.idl
+++ b/netwerk/cookie/nsICookiePermission.idl
@@ -13,7 +13,7 @@ typedef long nsCookieAccess;
 /**
  * An interface to test for cookie permissions
  */
-[scriptable, uuid(4b1a775d-f6d3-4389-be2e-9dfbaf2ab47b)]
+[scriptable, uuid(11ddd4ed-8f5b-40b3-b2a0-27c20ea1c88d)]
 interface nsICookiePermission : nsISupports
 {
   /**
@@ -95,24 +95,6 @@ interface nsICookiePermission : nsISupports
                        in nsICookie2 aCookie,
                        inout boolean aIsSession,
                        inout int64_t aExpiry);
-
-  /**
-   * getOriginatingURI
-   *
-   * determines the originating URI for a load given a channel, for third-party
-   * cookie blocking. this is done by leveraging the loadgroup of the channel to
-   * find the root content docshell, and the URI associated with its principal.
-   * if the root content docshell or its principal's URI cannot be obtained,
-   * this method will throw.
-   *
-   * @param aChannel
-   *        the channel for the load trying to get or set cookies
-   *
-   * @return the originating URI.
-   *
-   * @status DEPRECATED -- use mozIThirdPartyUtil instead.
-   */
-  nsIURI getOriginatingURI(in nsIChannel aChannel);
 };
 
 %{ C++