var ucjs_MemoryMonitor = {
    _interval: 2000, //ms
    _maxMemory: 700, // если больше, то текст индикатора станет жирным
    _prefix: "MiB", //B, KB, KiB, MB, MiB, GB, GiB
    _dPrefix: true,
    _inURLbar: true, // true - в адресной строке, false в статусбаре(панель дополнений)

    interval: null,

    init: function () {
        if (!document.getElementById("ucjs_MemoryMonitor")) {
            var memoryPanel = document.createElement("statusbarpanel");
            memoryPanel.id = "ucjs_MemoryMonitor";
            memoryPanel.setAttribute("label", this.setPrefix(this._dPrefix));

            if (this._inURLbar) {
                document.getElementById("urlbar-icons").appendChild(memoryPanel);
            } else {
                try {
                    document.getElementById("status-bar").appendChild(memoryPanel);
                } catch (e) {
                    document.getElementById("addon-bar").appendChild(memoryPanel);
                }

            }
        }
        this.start();
        this.interval = setInterval(this.start, this._interval);

    },
    uninit: function () {
        clearInterval(ucjs_MemoryMonitor.interval);
    },

    destroy: function () {
        this.uninit();
        var m = document.getElementById("ucjs_MemoryMonitor");
        if (m)
            m.parentNode.removeChild(m);
        ucjs_MemoryMonitor = null;
    },

    addFigure: function (str) {
        var num = new String(str).replace(/,/g, "");
        while (num != (num = num.replace(/^(-?\d+)(\d{3})/, "$1,$2")));
        return num;
    },

    getSize: function (mem, flag) {
        var pre = 1;
        switch (this._prefix) {
        case 'KB':
            pre = 1000;
            break;
        case 'KiB':
            pre = 1024;
            break;
        case 'MB':
            pre = 1000 * 1000;
            break;
        case 'MiB':
            pre = 1024 * 1024;
            break;
        case 'GB':
            pre = 1000 * 1000 * 1000;
            break;
        case 'GiB':
            pre = 1024 * 1024 * 1024;
            break;
        };

        if (flag)
            return mem * pre;
        else
            return ucjs_MemoryMonitor.addFigure(Math.round(mem / pre));
    },

    setPrefix: function (flag) {
        return (flag) ? " " + this._prefix : "";
    },

    start: function () {
        try {
            const Cc = Components.classes;
            const Ci = Components.interfaces;
            var mgr = Cc["@mozilla.org/memory-reporter-manager;1"].getService(Ci.nsIMemoryReporterManager);
            /*
            var e = mgr.enumerateReporters();
            var gMemReporters = {};
            while (e.hasMoreElements()) {
                var mr = e.getNext().QueryInterface(Ci.nsIMemoryReporter);
                gMemReporters[mr.path] = mr;
            };
            var workingSet = gMemReporters["resident"].amount;
            */
            var workingSet = mgr.resident;
            var restartMemory = ucjs_MemoryMonitor.getSize(ucjs_MemoryMonitor._maxMemory, true);
            var memoryPanel = document.getElementById("ucjs_MemoryMonitor");
            memoryPanel.setAttribute("label", ucjs_MemoryMonitor.getSize(workingSet) + ucjs_MemoryMonitor.setPrefix(ucjs_MemoryMonitor._dPrefix));
            //memoryPanel.setAttribute("memload", "norm");
            if (workingSet > restartMemory) {
                memoryPanel.setAttribute("memload", "high");
            } else {
                memoryPanel.setAttribute("memload", "norm");
            }
        } catch (e) {
            clearInterval(ucjs_MemoryMonitor.interval);
        }
    }

};

var cssStr = ('\
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");\n\
@-moz-document url("' + window.location.href + '") {\n\
    #ucjs_MemoryMonitor {\n\
        /*font-size: -moz-use-system-font !important;*/\n\
        -moz-appearance: none !important;\n\
        padding: 0 !important;\n\
        margin: 0 !important;\n\
        background: transparent !important;\n\
        border: 0 !important;\n\
    }\n\
    #ucjs_MemoryMonitor > .statusbarpanel-text {\n\
        font-size: 1em !important;\n\
        margin-top: 0 !important;\n\
        margin-bottom: 0 !important;\n\
        -moz-margin-start: 3px !important;\n\
        -moz-margin-end: 3px !important;\n\
    }\n\
    #ucjs_MemoryMonitor[memload="high"] .statusbarpanel-text {\n\
        font-weight: bold !important;\n\
    }\n\
}\n\
');
var cssURI = this.cssURI = Components.classes["@mozilla.org/network/io-service;1"]
    .getService(Components.interfaces.nsIIOService)
    .newURI("data:text/css," + encodeURIComponent(cssStr), null, null);
var sss = this.sss = Components.classes["@mozilla.org/content/style-sheet-service;1"]
    .getService(Components.interfaces.nsIStyleSheetService);
if (!sss.sheetRegistered(cssURI, sss.USER_SHEET))
    sss.loadAndRegisterSheet(cssURI, sss.USER_SHEET);

if (typeof addDestructor == "function" &&  // userChromeJS/uc
    addDestructor != ("addDestructor" in window && window.addDestructor)) {
    addDestructor(function (reason) {
        if (reason != "destructor") {
            let sss = this.sss;
            let cssURI = this.cssURI;
            if (sss.sheetRegistered(cssURI, sss.USER_SHEET))
                sss.unregisterSheet(cssURI, sss.USER_SHEET);
        }
        if (ucjs_MemoryMonitor) {
            ucjs_MemoryMonitor.destroy();
        }
    }, this);
} 
ucjs_MemoryMonitor.init();