function Fsj(){
  var btns = new Array();
  var j = 0;

  this.init=function(){
    var links= document.getElementsByTagName("a");
    for(var i=0;i<links.length;i++){
      if (links[i].getAttribute("class")=="W_addbtn" && links[i].getAttribute("item-func") == "addFollow"){ 
        btns[j] = links[i];
        j++;
      }
    }
  };
  /**/
  var index = 0;
  this.follow=function(){
    if (index <= btns.length-1){
      console.log("No."+(index+1));
      btns[index].click();
      index++;
    }else{
      clearInterval(timer);
    }
  };

  this.init();
  var timer = setInterval("this.follow();",6000);
  console.log("sum:"+(j+1));
}

FireFox 13+FireBug 测试通过，刷粉丝需要到某个用户的粉丝界面，间隔时间可以调整。