const commands = {
    MG_NAVIGATE: 1,
    MG_UPDATE_URI: 2,
    MG_GO_FORWARD: 3,
    MG_GO_BACK: 4,
    MG_NAV_STARTING: 5,
    MG_NAV_COMPLETED: 6,
    MG_RELOAD: 7,
    MG_CANCEL: 8,
    MG_CREATE_TAB: 10,
    MG_UPDATE_TAB: 11,
    MG_SWITCH_TAB: 12,
    MG_CLOSE_TAB: 13,
    MG_CLOSE_WINDOW: 14,
    MG_SHOW_OPTIONS: 15,
    MG_HIDE_OPTIONS: 16,
    MG_OPTIONS_LOST_FOCUS: 17,
    MG_OPTION_SELECTED: 18,
    MG_SECURITY_UPDATE: 19,
    MG_UPDATE_FAVICON: 20,
    MG_GET_SETTINGS: 21,
    MG_GET_FAVORITES: 22,
    MG_REMOVE_FAVORITE: 23,
    MG_CLEAR_CACHE: 24,
    MG_CLEAR_COOKIES: 25,
    MG_GET_HISTORY: 26,
    MG_REMOVE_HISTORY_ITEM: 27,
    MG_CLEAR_HISTORY: 28
};