Parse Chrome Preferences

def __check_preferences_json(self, preferences):
    """Pulls Extension information out of the preferences file
    """
    extensions = []
    with open(preferences, 'rb') as f:
        prefs_json = json.load(f)

        extensions_json = prefs_json['extensions']['settings']
        for extension in extensions_json.iterkeys():
            name = None
            version = None
            if 'manifest' in extensions_json[extension]:
                name = extensions_json[extension]['manifest']['name']
                version = extensions_json[extension]['manifest']['version']
            #e = Extension(self.os.CHROME_NAME, name, version, None, extension)
            e = Extension(name, version, None, extension)
            extensions.append(e.todict())