JavaScript Set Homepage and Favorite

// JavaScript Set Homepage and Favorite
// <a href="javascript:AddFavorite(window.location,document.title)">加入收藏</a>
//It calls the Add Favorite dialog box in IE and links to a url in Firefox and Safari (but again not Opera ). Geovin Du
//http://stackoverflow.com/questions/946189/how-can-i-set-default-homepage-in-ff-and-chrome-via-javascript
//http://www.webdeveloper.com/forum/showthread.php?180428-Set-homepage-script
//IE 11.0 Windows7 无效.
function AddFavorite(sURL, sTitle) {
    try {
        window.external.addFavorite(sURL, sTitle);
    }
    catch (e) {
        try {
            window.sidebar.addPanel(sTitle, sURL, "");
        }
        catch (e) {
            alert("加入收藏失败，请使用Ctrl+D进行添加");
        }
    }
}
//<a href="#" onclick="javascript:SetHome(this,window.location);" >设为首页</a>
//
function SetHome(obj, vrl) {
    try {
        obj.style.behavior = 'url(#default#homepage)'; obj.setHomePage(vrl);
    }
    catch (e) {
        if (window.netscape) {
            try {
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
            }
            catch (e) {
                alert("此操作被浏览器拒绝！
请在浏览器地址栏输入“about:config”并回车
然后将 [signed.applets.codebase_principal_support]的值设置为'true',双击即可。");
            }
            var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
            prefs.setCharPref('browser.startup.homepage', vrl);
        }
    }
}