UserScript to avoid Facebook's URL director

facebook_url_redirect_avoid.js

// ==UserScript==
// @name        Facebook URL Redirector Bypass
// @namespace   in.bibhas
// @include     https://*.facebook.com/*
// @version     1
// @grant       none
// ==/UserScript==
si = window.setInterval(clearanchors, 2000);
function clearanchors(){
    anchors = document.getElementsByTagName('a');
    for(i=0;i<anchors.length;i++){
        var poisoned_url = anchors[i].getAttribute('href');
        if(poisoned_url && poisoned_url.match(/(http|https):\/\/(l|www).facebook.com\/l\.php\?u\=(.*)/g)){
            poisoned_url = poisoned_url.replace(/(http|https):\/\/(l|www).facebook.com\/l\.php\?u\=/g, '');
            poisoned_url = poisoned_url.replace(/\&h\=.*/g, '');
            anchors[i].setAttribute('class', '');
            anchors[i].setAttribute('onclick', '');
            anchors[i].setAttribute('target', '_blank');
            anchors[i].setAttribute('href', decodeURIComponent(poisoned_url));
        }
    }
}