Issue 3935 - Force wmode to transparent to enable more flash screenshots

run.py

 #!/usr/bin/env python
 # coding: utf-8
 
 import argparse
 import datetime
 import errno
 import hashlib
 import io
 import json
 import os
@@ skipping 122 matching lines @@
     profile = FirefoxProfile(
       addons=[
         crawlerxpi,
         abpxpi,
       ],
       preferences={
         'browser.tabs.warnOnCloseOtherTabs': False,
         'browser.uitour.enabled': False,
         'prompts.tab_modal.enabled': False,
         'xpinstall.signatures.required': False,
+        'plugins.force.wmode': 'transparent',
       }
     )
 
     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:
         if '=' in url:
@@ skipping 38 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()