Issue 3815 - Fix TabAllocator. Now it returns tab with initialized outerWindowID

run.py

 #!/usr/bin/env python
 # coding: utf-8
 
 import argparse
 import datetime
 import errno
 import hashlib
 import io
 import json
 import os
@@ skipping 121 matching lines @@
             os.close(handle)
             cleanup.append(abpxpi)
             packager.createBuild(parameters.abpdir, outFile=abpxpi, releaseBuild=True)
 
         profile = FirefoxProfile(
             addons=[
                 crawlerxpi,
                 abpxpi,
             ],
             preferences={
+                'browser.startup.homepage': 'about:blank',
                 'browser.tabs.warnOnCloseOtherTabs': False,
                 'browser.uitour.enabled': False,
                 'prompts.tab_modal.enabled': False,
+                'startup.homepage_welcome_url': 'about:blank',
+                'startup.homepage_welcome_url.additional': 'about:blank',
                 'xpinstall.signatures.required': 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'
             print >>handle, 'version=4'
             for url in parameters.filters:
@@ skipping 39 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()