diff -r 000000000000 -r 6474c204b198 content/base/public/nsIDroppedLinkHandler.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/public/nsIDroppedLinkHandler.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIDOMDragEvent;
+interface nsIURI;
+
+[scriptable, uuid(6B58A5A7-76D0-4E93-AB2E-4DE108683FF8)]
+interface nsIDroppedLinkHandler : nsISupports
+{
+  /**
+   * Determines if a link being dragged can be dropped and returns true if so.
+   * aEvent should be a dragenter or dragover event.
+   *
+   * If aAllowSameDocument is false, drops are only allowed if the document
+   * of the source of the drag is different from the destination. This check
+   * includes any parent, sibling and child frames in the same content tree.
+   * If true, the source is not checked.
+   */
+  boolean canDropLink(in nsIDOMDragEvent aEvent, in boolean aAllowSameDocument);
+
+  /**
+   * Given a drop event aEvent, determines the link being dragged and returns
+   * it. If a uri is returned the caller can, for instance, load it. If null
+   * is returned, there is no valid link to be dropped.
+   *
+   * A NS_ERROR_DOM_SECURITY_ERR error will be thrown and the event cancelled if
+   * the receiving target should not load the uri for security reasons. This
+   * will occur if any of the following conditions are true:
+   *  - the source of the drag initiated a link for dragging that
+   *    it itself cannot access. This prevents a source document from tricking
+   *    the user into a dragging a chrome url, for example.
+   *  - aDisallowInherit is true, and the URI being dropped would inherit the
+   *    current document's security context (URI_INHERITS_SECURITY_CONTEXT).
+   *
+   * aName is filled in with the link title if it exists, or an empty string
+   * otherwise.
+   */
+  AString dropLink(in nsIDOMDragEvent aEvent, out AString aName,
+                   [optional] in boolean aDisallowInherit);
+};