X-notifier for Firefox (WebMail Notifier) dont work anymore with last version

Hello guys,i need desperately last version of this notfier for Firefox...the last one dont work anymore with last version installed,please i need so bad of this.Can you create and help us with a new one notifier to install for Firefox? I have 46 years old,i need to check multiple mail accounts,and i use only Firefox,is much easier for me.I really apreciate some help here,guys,i respect your work and i have faith in you to help us,Firfox users.

With respect,Maryo.