How to change Firefox proxy from addon

Question

I cannot change the Firefox proxy through the code below:

var scope = {};
Components.utils.import("resource://imacros/utils.js", scope);
Components.utils.import("resource://imacros/rijndael.js", scope);
Components.utils.import("resource://gre/modules/ctypes.jsm", scope);
var __loginf = scope.__loginf;
var imns = scope.imns;

var pref = imns.prefsvc.getBranch("network.proxy.");
pref.setCharPref("http", server);
pref.setIntPref("http_port", port);
pref.setCharPref("ssl", server);
pref.setIntPref("ssl_port", port);
pref.setIntPref("type", 1);

Help me please.

Answer 1

You must use addon-sdk. Here is a link to their documents for the service, where you can find additional information.

Here's what the addon-sdk solution might look like.

var prefsvc = require("sdk/preferences/service");
prefsvc.set("network.proxy.http", server);
prefsvc.set("network.proxy.http_port", port);
prefsvc.set("network.proxy.ssl", server);
prefsvc.set("network.proxy.ssl_port", port);
prefsvc.set("network.proxy.type", 1);