Proxy Auto Configuration

proxy.pac

/**
 *  Proxy auto configuration file for accessing sites blocked in Iran due to
 *   sanctons or filtering. To use, a socks5 proxy must be running and accessible
 *   on localhost port 1080. Set url of this gist in "Automatic proxy configuration URL"
 *   field in "Network Proxy Settings" in Firefox.
 */

function FindProxyForURL(url, host) {
  var blockedHosts = [
    'twitter.com', 'twimg.com',  // Twitter                
    '.youtube.com', '.ytimg.com', '.googlevideo.com', '.ggpht.com',  // YouTube
    '.firebaseio.com',  // Firebase                        
    '.bbc.com', '.bbc.co.uk', '.bbci.co.uk',  // BBC
    'medium.com', // Medium
    'hacks.mozilla.org', 'blog.mozilla.org', // Tech Sites
    '.netdna-ssl.com', // CDNs
    '.keycdn.com', // Other Sites 1
  ];
  for (var i=0; i<blockedHosts.length; i++) {
    if (host.indexOf(blockedHosts[i]) >= 0)
      return "SOCKS5 127.0.0.1:1080";
  }
  return "DIRECT";
}