メモリ情報をcontentスコープから取得できるように拡張

getMemoryInfo.uc.js

// ==UserScript==
// @name           getMemoryInfo
// @namespace      http://efcl.info/
// @description    メモリ情報をcontentスコープから取得できるように拡張
// @include        main
// ==/UserScript==
var memoryInfo = {
    init: function(event) {
        let doc = event.originalTarget;
        //alert(doc.defaultView.location.href);
        if (doc instanceof HTMLDocument) {
            var win = doc.defaultView.wrappedJSObject;
            if (!win.getMemoryInfo) {
                win.getMemoryInfo = memoryInfo.getMemoryInfo;
            }
        }
    },
    getMemoryInfo: function() {
        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 mapped = gMemReporters["malloc/mapped"].memoryUsed;
        var allocated = gMemReporters["malloc/allocated"].memoryUsed;
        var committed = gMemReporters["malloc/committed"].memoryUsed;
        var dirty = gMemReporters["malloc/dirty"].memoryUsed;
        return {
            "mapped": mapped,
            "allocated": allocated,
            "committed": committed,
            "dirty": dirty
        }
    }
}
gBrowser.addEventListener("load", memoryInfo.init, true);