/usr/share/idl/thunderbird/mozIJSSubScriptLoader.idl is in thunderbird-dev 1:24.4.0+build1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * 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"
[scriptable, uuid(837d0211-c448-4bb8-a9bf-922ba33b9d37)]
interface mozIJSSubScriptLoader : nsISupports
{
    /**
     * This method should only be called from JS!
     * In JS, the signature looks like:
     * rv loadSubScript (url [, obj] [, charset]);
     * @param url the url if the sub-script, it MUST be either a file:,
     *            resource:, or chrome: url, and MUST be local.
     * @param obj an optional object to evaluate the script onto, it
     *            defaults to the global object of the caller.
     * @param charset optionally specifies the character encoding of
     *                the file. If absent, the file is interpreted
     *                as ASCII.
     * @retval rv the value returned by the sub-script
     */
    [implicit_jscontext]
    jsval loadSubScript(in AString url, [optional] in jsval obj, [optional] in AString charset);
};
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