No issue - prevent showing of tabs closing confirmation dialog

run.py

 #!/usr/bin/env python
 # coding: utf-8
 
 import argparse
 import datetime
 import errno
 import hashlib
 import io
 import json
 import os
@@ skipping 118 matching lines @@
       os.close(handle)
       cleanup.append(abpxpi)
       packager.createBuild(parameters.abpdir, outFile=abpxpi, releaseBuild=True)
 
     profile = FirefoxProfile(
       addons=[
         crawlerxpi,
         abpxpi,
       ],
       preferences={
-        'browser.tabs.warnOnClose': False,
         'browser.tabs.warnOnCloseOtherTabs': False,
         'browser.uitour.enabled': False,
         'prompts.tab_modal.enabled': False,
       }
     )
 
     abpsettings = os.path.join(profile.profile, 'adblockplus')
     os.makedirs(abpsettings)
     with open(os.path.join(abpsettings, 'patterns.ini'), 'w') as handle:
       print >>handle, '# Adblock Plus preferences'
@@ skipping 41 matching lines @@
   BASE_DIR = os.path.dirname(os.path.abspath(__file__))
   DEPENDENCY_SCRIPT = os.path.join(BASE_DIR, "ensure_dependencies.py")
 
   try:
     subprocess.check_call([sys.executable, DEPENDENCY_SCRIPT, BASE_DIR])
   except subprocess.CalledProcessError as e:
     print >>sys.stderr, e
     print >>sys.stderr, "Failed to ensure dependencies being up-to-date!"
 
   run()