lib/main.js


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var {Cc, Ci} = require('chrome');

var observer = {
  observe: function(subject, topic, data) {
    if (topic == 'http-on-modify-request') {
      var channel = subject.QueryInterface(Ci.nsIHttpChannel);
      if (/haaretz\.co(m|\.il)/.test(channel.originalURI.host)) {
        channel.setRequestHeader('User-Agent', 'Googlebot/2.1 (+http://www.googlebot.com/bot.html)', false);
      }
    }
  }
};

var observerService = Cc['@mozilla.org/observer-service;1'].getService(Ci.nsIObserverService);
observerService.addObserver(observer, 'http-on-modify-request', false);