session is not expiring

i set file based sessions and the sessions are not expiring even after closing browser. its the issues in chrome but firefox is good. how can i fix it.

here is my config

MIDDLEWARE_CLASSES = (

    'django.middleware.common.CommonMiddleware',

    'django.contrib.sessions.middleware.SessionMiddleware',

    'django.contrib.auth.middleware.AuthenticationMiddleware',

    'django.contrib.messages.middleware.MessageMiddleware',

)

SESSION_ENGINE = 'django.contrib.sessions.backends.file'

SESSION_EXPIRE_AT_BROWSER_CLOSE = True

SESSION_FILE_PATH = os.getenv("HOME") + '/sessions'

INSTALLED_APPS = (

    'django.contrib.auth',

    'django.contrib.contenttypes',

    'django.contrib.sessions',

..........

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