Almost as good as the Chrome version, though there are some things that are a little broken.

- "Hamburger" menu doesn't do anything (but I prefer it closed anyway).
- Feels a lot more sluggish than in Chrome (opening the menu, the settings page, etc)
- Rich notifications aren't really that rich without buttons, but I think that's Firefox's fault for not providing the ability.

Of those, the lack of good notifications is the real bummer. Hopefully that improves in time.

Great support with a lot of customization. It also works perfectly on Firefox 57.
But it has a lacking. It does not provide email notification icon on taskbar.
It would be great if this addon shows a blinking icon on taskbar when there are unread emails.
And this blinking should be continued until the user reads the emails.

С горем пополам заработал. В отличие от прочих.

no longer working with nightly 58 check the issue please

excelente extencion para gmail, inbox. solo necesita añadir compatibilidad con outlook, hotmail.