After some struggling with cookies option and relogin to my account it seems to work, before that it was blue icon, I had to find out again how to define all this labels, but after hour of searching solutions it's working, steel slow, but working.

Anyone with Firefox 57 if you see blue icon here is what I've done:
1. Turn off accepting cookies in firefox privacy options.
2. Try to log in to your gmail account
3. Read that you can't without accepting cookies
4. Back to firefox privacy options and check accepting cookies on again
5. Log in to your account.
6. If you defined your account labels properly it should work, in my first account field I wrote this:
e.g.:inbox, important, imp, promotions, updates

Very usefull

don't work "Get unread message notifications on Windows taskbar notification area (system tray)"

57.0b10 (64 bit) version

First the update doesn't have the option to hide my account filters in the tooltip/popup anymore, including the "middle mouse button to refresh" option, then it doesn't delete emails from the pop-up window sometimes, and now this.
The add-on does not detect my gmail accounts at all anymore and constantly keeps asking me to log in.
I am already logged in, and have already tried refreshing firefox, clearing history, cache, cookies, everything. Running in safe mode, reinstalling the addon, and then in normal mode doesn't do anything.
I've been using "Gmail Notifier (restartless)" for a long time now, and am disappointed that it might have broken everything with this new update - since none of the OTHER notifiers work anymore either.

I can't delete an email before it loads, also if i press delete and close addon popup it won't delete, it used to work before the update.

This program always worked perfectly for me, that is until the latest update. Suddenly I cannot get the notifier in the taskbar to appear, and I can no longer get it to open in new window from the toolbar, The setting options are there, but they just do nothing when you click on the icon.

After the latest update it does not work at all, even when I logged in it's asking for log into your account and remains disconnected.

The addon now shows the gmail icon only on firefox like any other addon.

It was the most awaited addon for me and at last I can use it!