All data is back when install old version.
Here is the old version on x-notifier:
https://addons.mozilla.org/en-US/firefox/addon/xnotifier/versions/
Cheers.

Desde que Firefox actualizó su navegador a la última versión v49.0.2 e incluso en las betas v50.x, todo el trabajo anteriormente realizado por el desarrollador del complemento se ha ido a la basura, ya que ha dejado de funcionar y pierde constantemente la configuración almacenada de las cuentas. En fin, ¡¡¡UN DESASTRE TOTAL!!!

Hi, I've been using this plugin for several years now and badly need to work it out on latest version of firefox please?

PLEASE PLEASE make it work with Firefox 49.0.. I don't want to use other plugin.

This great add-on has stopped working with the latest updates of Firefox. Is dead.

We really need this.

Dear best email notifier...

why you doesnt work 49.0??

Лучших нету, но перестал обновлять, придется удалять (

никто не решил пробл с рамблером?

The best email notifier out there A+++
Please update as it isn`t compatible with Firefox 49 ☹.
Thanks

Revert back to Version 3.5.23 works.

https://addons.mozilla.org/en-US/firefox/addon/xnotifier/versions/?page=1#version-3.5.23

Does not work with Firefox 50 beta

and Firefox Nightly 52.01A - not work

Best Regards

Nikiforov

I noticed that latest version does not store account information. Once you restarted firefox all your account and configuration is lost.

I have many acounts of yahoo, it just active one

X-Notifier (latest version is 3.5.23) works great with Firefox 49.x and below.
The API programming interface is changing with Firefox 50.x and so X-Notifier cannot continue with the same features.
The newer version, X-Notifier Neo has been recommended for Firefox 50.x and above.

I am using the ESR version, on Puppy Linux Slacko 5.6 32bit. i have used xnotifier for several years, so I am very disappointed.

this is a reliable email notifier. i hope it gets updated for future FF builds.

It seems it doesn't support e10s but since e10s is disabled on my profile, I couldn't say if it still properly works despite that.

I know mozilla changes too frequently and it's pain in the as* for dev to maintain their add-on. I empathize with you. I hope it will be compliant with future firefox release. I love it.

Do you plan to update it to make it e10s compliant?