Missing JS Shell in Mozilla v20 build

utils.py

 # coding: utf-8
 
 # This Source Code is subject to the terms of the Mozilla Public License
 # version 2.0 (the "License"). You can obtain a copy of the License at
 # http://mozilla.org/MPL/2.0/.
 
 import sys, os, urllib, zipfile
 from StringIO import StringIO
 
 def ensureJSShell():
   baseDir = os.path.dirname(__file__)
   shell_dir = os.path.join(baseDir, 'mozilla')
   if not os.path.exists(shell_dir):
     os.makedirs(shell_dir)
   if sys.platform == 'win32':
     path = os.path.join(shell_dir, 'js.exe')
   else:
     path = os.path.join(shell_dir, 'js')
   if os.path.exists(path):
     return path
 
   platform_map = {
     'win32': 'win32',
     'linux2': 'linux-i686',
     'darwin': 'mac',
   }
   if sys.platform not in platform_map:
     raise Exception('Unknown platform, is there a JS shell version for it?')
 
-  download_url = 'https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/20.0-candidates/build1/jsshell-%s.zip' % platform_map[sys.platform]
+  download_url = 'https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/17.0.11esr-candidates/build1/jsshell-%s.zip' % platform_map[sys.platform]
   data = StringIO(urllib.urlopen(download_url).read())
   zip = zipfile.ZipFile(data)
   zip.extractall(shell_dir)
   zip.close()
 
   if not os.path.exists(path):
     raise Exception('Downloaded package didn\'t contain JS shell executable')
 
   try:
     os.chmod(path, 0700)
   except:
     pass
 
   return path