通过获取firefox的session信息，实现自动登录

Question

最近在撸《用python写爬虫》，其中看到这么一章节，讲自动登录：
1.手动登录网站，firefox产生sesion，脚本获取session文件进行解析后实现登录

以下是实现源码：

def login_firefox():
    """load cookies from firefox
    """
    session_filename = find_ff_sessions()
    cj = load_ff_sessions(session_filename)
    opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
    html = opener.open(COUNTRY_URL).read()

    tree = lxml.html.fromstring(html)
    print tree.cssselect('ul#navbar li a')[0].text_content()
    return opener


def load_ff_sessions(session_filename):
    cj = cookielib.CookieJar()
    if os.path.exists(session_filename):  
        try: 
            json_data = json.loads(open(session_filename, 'rb').read())
        except ValueError as e:
            print 'Error parsing session JSON:', str(e)
        else:
            for window in json_data.get('windows', []):
                for cookie in window.get('cookies', []):
                    import pprint; pprint.pprint(cookie)
                    c = cookielib.Cookie(0, cookie.get('name', ''), cookie.get('value', ''), 
                        None, False, 
                        cookie.get('host', ''), cookie.get('host', '').startswith('.'), cookie.get('host', '').startswith('.'), 
                        cookie.get('path', ''), False,
                        False, str(int(time.time()) + 3600 * 24 * 7), False, 
                        None, None, {})
                    cj.set_cookie(c)
    else:
        print 'Session filename does not exist:', session_filename
    return cj


def find_ff_sessions():
    """不同系统的文件路径不同，从上到下分别是linux，os，window
    """
    paths = [
        '~/.mozilla/firefox/*.default',
        '~/Library/Application Support/Firefox/Profiles/*.default',
        '%APPDATA%/Roaming/Mozilla/Firefox/Profiles/*.default'
    ]
    for path in paths:
        filename = os.path.join(path, 'sessionstore.js')
        matches = glob.glob(os.path.expanduser(filename))
        if matches:
            return matches[0]
            
 if __name__ == '__main__':
    login_firefox()

本人window10系统，但是我在firefox文件（AppDataRoamingMozillaFirefoxProfilessv805njd.default）里面就是找不到sessionstore.js

所以，我就奇怪了，这种做法靠谱么？
还是因为firefox版本问题，所以sessionstore.js不存在？