function  addCookie() {   //  加入收藏夹 
             if  (document.all) {
                window.external.addFavorite( ' http://wjxa.iteye.com/ ' ,  ' start ' );
            }
             else   if  (window.sidebar) {
            window.sidebar.addPanel( ' start' ,  ' http://wjxa.iteye.com/ ' ,  "" );
            }
        }

         function  setHomepage() {   //  设置首页 
             if  (document.all) {
                document.body.style.behavior  =   ' url(#default#homepage) ' ;
                document.body.setHomePage( ' http://wjxa.iteye.com/ ' );

            }
             else   if  (window.sidebar) {
                 if  (window.netscape) {
                     try  {
                        netscape.security.PrivilegeManager.enablePrivilege( " UniversalXPConnect " );
                    }
                     catch  (e) {
                        alert( " 该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true " );
                    }
                }
                 var  prefs  =  Components.classes[ ' @mozilla.org/preferences-service;1 ' ].getService(Components.interfaces.nsIPrefBranch);
                prefs.setCharPref( ' browser.startup.homepage ' ,  ' http://taotao.wsyren.com ' );
            }

        }

亲测可用！ 

摘录自：http://csprogrammer.blog.51cto.com/212533/51081 

调用方法： 

     < a  href ="javascript:void(0)"  onclick ="setHomepage()" > 设为首页 </ a >  
     < a  href ="javascript:void(0)"  onclick ="addCookie()" > 加入收藏 </ a >