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diff --git a/addon-sdk/source/lib/sdk/keyboard/hotkeys.js b/addon-sdk/source/lib/sdk/keyboard/hotkeys.js
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--- a/addon-sdk/source/lib/sdk/keyboard/hotkeys.js
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-/* 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/. */
-
-"use strict";
-
-module.metadata = {
- "stability": "unstable"
-};
-
-const { observer: keyboardObserver } = require("./observer");
-const { getKeyForCode, normalize, isFunctionKey,
- MODIFIERS } = require("./utils");
-
-/**
- * Register a global `hotkey` that executes `listener` when the key combination
- * in `hotkey` is pressed. If more then one `listener` is registered on the same
- * key combination only last one will be executed.
- *
- * @param {string} hotkey
- * Key combination in the format of 'modifier key'.
- *
- * Examples:
- *
- * "accel s"
- * "meta shift i"
- * "control alt d"
- *
- * Modifier keynames:
- *
- * - **shift**: The Shift key.
- * - **alt**: The Alt key. On the Macintosh, this is the Option key. On
- * Macintosh this can only be used in conjunction with another modifier,
- * since `Alt+Letter` combinations are reserved for entering special
- * characters in text.
- * - **meta**: The Meta key. On the Macintosh, this is the Command key.
- * - **control**: The Control key.
- * - **accel**: The key used for keyboard shortcuts on the user's platform,
- * which is Control on Windows and Linux, and Command on Mac. Usually, this
- * would be the value you would use.
- *
- * @param {function} listener
- * Function to execute when the `hotkey` is executed.
- */
-exports.register = function register(hotkey, listener) {
- hotkey = normalize(hotkey);
- hotkeys[hotkey] = listener;
-};
-
-/**
- * Unregister a global `hotkey`. If passed `listener` is not the one registered
- * for the given `hotkey`, the call to this function will be ignored.
- *
- * @param {string} hotkey
- * Key combination in the format of 'modifier key'.
- * @param {function} listener
- * Function that will be invoked when the `hotkey` is pressed.
- */
-exports.unregister = function unregister(hotkey, listener) {
- hotkey = normalize(hotkey);
- if (hotkeys[hotkey] === listener)
- delete hotkeys[hotkey];
-};
-
-/**
- * Map of hotkeys and associated functions.
- */
-const hotkeys = exports.hotkeys = {};
-
-keyboardObserver.on("keydown", function onKeypress(event, window) {
- let key, modifiers = [];
- let isChar = "isChar" in event && event.isChar;
- let which = "which" in event ? event.which : null;
- let keyCode = "keyCode" in event ? event.keyCode : null;
-
- if ("shiftKey" in event && event.shiftKey)
- modifiers.push("shift");
- if ("altKey" in event && event.altKey)
- modifiers.push("alt");
- if ("ctrlKey" in event && event.ctrlKey)
- modifiers.push("control");
- if ("metaKey" in event && event.metaKey)
- modifiers.push("meta");
-
- // If it's not a printable character then we fall back to a human readable
- // equivalent of one of the following constants.
- // http://dxr.mozilla.org/mozilla-central/source/dom/interfaces/events/nsIDOMKeyEvent.idl
- key = getKeyForCode(keyCode);
-
- // If only non-function (f1 - f24) key or only modifiers are pressed we don't
- // have a valid combination so we return immediately (Also, sometimes
- // `keyCode` may be one for the modifier which means we do not have a
- // modifier).
- if (!key || (!isFunctionKey(key) && !modifiers.length) || key in MODIFIERS)
- return;
-
- let combination = normalize({ key: key, modifiers: modifiers });
- let hotkey = hotkeys[combination];
-
- if (hotkey) {
- try {
- hotkey();
- } catch (exception) {
- console.exception(exception);
- } finally {
- // Work around bug 582052 by preventing the (nonexistent) default action.
- event.preventDefault();
- }
- }
-});