[Help] Updating an old add on for Firefox

Hello this is really my first time doing this kind of thing.
I have already learned how to unpack and pack a .jar file.

So first.
Heres the project.
https://addons.mozilla.org/en-US/firefox/addon/3915
Its link is out of date.
So I am trying to redirect it now.

Here is the source I guess

Code:

---

var DanbooruTB = {
  // vars
  _explicit    : false,
  _scroll      : 8,
  _results      : 100,
  offset        : 0,
  backlog      : null,

  // init
  onLoad: function () {
    window.addEventListener("unload", this.onUnload, false);
    this.backlog = new Array();
    var prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);
    var pbi = prefs.QueryInterface(Components.interfaces.nsIPrefBranchInternal);
    if (prefs.getPrefType("extensions.danboorutb.explicit") == prefs.PREF_BOOL)
      this._explicit = this.getBoolPref(prefs, "extensions.danboorutb.explicit");
    if (prefs.getPrefType("extensions.danboorutb.scroll") == prefs.PREF_INT)
      this._scroll = this.getIntPref(prefs, "extensions.danboorutb.scroll");
    if (prefs.getPrefType("extensions.danboorutb.results") == prefs.PREF_INT)
      this._results = this.getIntPref(prefs, "extensions.danboorutb.results");
    document.getElementById("danbooru_explicit").checked = this._explicit;
    pbi.addObserver("extensions.danboorutb.explicit", DanbooruTB, false);
    pbi.addObserver("extensions.danboorutb.scroll", DanbooruTB, false);
    pbi.addObserver("extensions.danboorutb.results", DanbooruTB, false);
  },

  // deinit
  onUnload: function () {
    var prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);
    var pbi = prefs.QueryInterface(Components.interfaces.nsIPrefBranchInternal);
    pbi.removeObserver("extensions.danboorutb.explicit", DanbooruTB, false);
    pbi.removeObserver("extensions.danboorutb.scroll", DanbooruTB, false);
    pbi.removeObserver("extensions.danboorutb.results", DanbooruTB, false);
  },

  // pref handlers
  observe: function (subject, topic, data) {
    var prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);
    if(data == "extensions.danboorutb.explicit")
      this._explicit = this.getBoolPref(prefs, "extensions.danboorutb.explicit");
    if(data == "extensions.danboorutb.scroll")
      this._scroll = this.getIntPref(prefs, "extensions.danboorutb.scroll");
    if(data == "extensions.danboorutb.results")
      this._results = this.getIntPref(prefs, "extensions.danboorutb.results");
  },

  // pref getters/setters (debugging)
  getBoolPref : function (pb, p) { try { return pb.getBoolPref(p); } catch(ex) { dump(ex + "\n"); } return false; },
  getIntPref : function (pb, p) { try { return pb.getIntPref(p); } catch(ex) { dump(ex + "\n"); } return false; },
  setBoolPref : function (pb, p, v) { try { return pb.setBoolPref(p, v); } catch(ex) { dump(ex + "\n"); } return false; },
  setIntPref : function (pb, p, v) { try { return pb.setIntPref(p, v); } catch(ex) { dump(ex + "\n"); } return false; },
 
  requestPosts: function () {
    document.getElementById("danbooru_status").value = "querying service...";
    var req = new XMLHttpRequest();
    var enctags = encodeURI(document.getElementById('danbooru_input').value);
    if(!this._explicit) enctags += "+rating:safe";
    req.open('GET', 'http://www.sagubooru.com/api/find_posts?tags=' + enctags + '&limit=' + this._results + '&offset=' + this.offset, true);
    req.onreadystatechange = function(aEvt) {
      if(req.readyState == 4)
        if(req.status == 200)
          DanbooruTB.parsePosts(req.responseXML);
    };
    req.send(null);
  },

  parsePosts: function (resp) {
    document.getElementById("danbooru_status").value = "parsing result...";
    var posts = resp.getElementsByTagName("post")
    var piclist = document.getElementById("danbooru-piclist");
    for(var i = 0; i < posts.length; i++) {
      var _box = document.createElement("box");
      var filename = posts[i].getAttribute("md5") + ".jpg";
      var fileid = posts[i].getAttribute("id");
      var tags = posts[i].getAttribute("tags");
      var path = "http://sagubooru.com/data/preview/" + filename.slice(0, 2) + "/" + filename.slice(2, 4) + "/" + filename;
      var fullpath = "http://sagubooru.com/post/view/" + fileid;
      _box.setAttribute("style", "background-image: url(" + path + ")", false);
      _box.setAttribute("onclick","if(event.button == 1) gBrowser.selectedTab = gBrowser.addTab(\"" + fullpath + "\"); else gBrowser.loadURI(\"" + fullpath + "\", null, null);", false);
      _box.setAttribute("tooltiptext","Tags: " + tags, false);
      piclist.appendChild(_box);
    }
    this.offset += posts.length;
    document.getElementById("danbooru_status").value = "last request returned " + posts.length + " results (" + this.offset + " total so far)";
  },

  inputHandler: function (event) {
    if(event.keyCode == event.DOM_VK_RETURN) {
      var piclist = document.getElementById("danbooru-piclist");
      while(piclist.hasChildNodes()) piclist.removeChild(piclist.firstChild);
      while(this.backlog.length > 0) this.backlog.pop();
      this.offset = 0;
      this.requestPosts();
      document.getElementById("danbooru-piclist-output").style.display = "block";
    }
  },
 
  clear: function () {
    document.getElementById('danbooru_status').value = '';
    document.getElementById('danbooru_input').value = 'Tags';
    document.getElementById('danbooru-piclist-output').style.display = 'none';
    var piclist = document.getElementById('danbooru-piclist');
    while(piclist.hasChildNodes()) piclist.removeChild(piclist.firstChild);
    while(this.backlog.length > 0) this.backlog.pop();
    this.offset = 0;
  },

  explictHandler: function (event) {
    var exp = document.getElementById("danbooru_explicit");
    var prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);
    this.setBoolPref(prefs, "extensions.danboorutb.explicit", !exp.checked);
    var tags = document.getElementById('danbooru_input').value;
    if(tags && tags != "Tags") {
      var piclist = document.getElementById("danbooru-piclist");
      while(piclist.hasChildNodes()) piclist.removeChild(piclist.firstChild);
      while(this.backlog.length > 0) this.backlog.pop();
      this.offset = 0;
      this.requestPosts();
    }
  },
 
  scroll: function (direction) {
    var piclist = document.getElementById("danbooru-piclist");
    switch(direction) {
    case 1:
      for(var i = 0; i < this._scroll; i++)
        if(piclist.firstChild) this.backlog.push(piclist.removeChild(piclist.firstChild));
      if(this.backlog.length >= this.offset - 3 * this._scroll) this.requestPosts();
      break;
    case -1:
      if(this.backlog.length > 0)
        for(var i = 0; i < this._scroll; i++)
          if(this.backlog.length > 0) piclist.insertBefore(this.backlog.pop(), piclist.firstChild);
      break;
    }
  }

} // DanbooruTB

window.addEventListener("load", function(e) { DanbooruTB.onLoad(e); }, false);

---

And here is what I guess needs the editing

Code:

---

req.open('GET', 'http://www.sagubooru.com/api/find_posts?tags=' + enctags + '&limit=' + this._results + '&offset=' + this.offset, true);

---

While looking through this now I have also notice something else thats important o.O
But before I take anything further I need pro help.

Here is what I've done

Code:

---


    req.open('GET', 'http://danbooru.donmai.us/post?tags=' + enctags + '&searchDefault=Search');

---

This probably needs editing too
But I don't know what to do so if someone could help me.

Code:

---

  parsePosts: function (resp) {
    document.getElementById("danbooru_status").value = "parsing result...";
    var posts = resp.getElementsByTagName("post")
    var piclist = document.getElementById("danbooru-piclist");
    for(var i = 0; i < posts.length; i++) {
      var _box = document.createElement("box");
      var filename = posts[i].getAttribute("md5") + ".jpg";
      var fileid = posts[i].getAttribute("id");
      var tags = posts[i].getAttribute("tags");
      var path = "http://sagubooru.com/data/preview/" + filename.slice(0, 2) + "/" + filename.slice(2, 4) + "/" + filename;
      var fullpath = "http://sagubooru.com/post/view/" + fileid;
      _box.setAttribute("style", "background-image: url(" + path + ")", false);
      _box.setAttribute("onclick","if(event.button == 1) gBrowser.selectedTab = gBrowser.addTab(\"" + fullpath + "\"); else gBrowser.loadURI(\"" + fullpath + "\", null, null);", false);
      _box.setAttribute("tooltiptext","Tags: " + tags, false);
      piclist.appendChild(_box);
    }

---

What do you need help with though the detecting the new update through FF?

Actually I use Lolifox and I'm just changing the site.
There are tons of sites with the name 'booru' in them.
I basically want to change the site to the official one.

The first stuff in the first code section is another site.
I just wanna change the site.
They use the same source for the site too I think.