Best in it's class. Lots of well thought out options so you configure exactly the way you want. Developer extremely responsive - issues resolved quickly. This isn't one of those extensions that rest on it's laurels and before you know it are showing their age. The entire Checker Plus series of addons are consistently evolving - the developer is always thinking about ways to improve them. The Checker Plus extensions were originally developed for the Chrome browser where they have been very popular for years. This developer took the time and effort to port his extensions early on in the Fx web-extension process. He didn't wait for Fx 57. Highly recommended.

Can not login on Firefox 57. Please make it work.

I love this extension and was a huge fan of it on chrome, I'm so happy it's on firefox as well.

Used this on Chrome for many years, and I'm glad to see it on Firefox too. Thanks Jason! Very happy user!

No side bar, where u can choose between different accounts.
Feels like it going to stop working after any action.
Window with email are smaller than in chrome. i think so.

Для хрома отличное расширение, но на ff57 даже не запускается. Fail. Fix it! https://goo.gl/xA2ZyQ

Feels slower compared to its Chrome counterpart, getting blank toasts, Looking forward to it getting fixed.

If I want to copy something from an email in the popup and press ctrl+c it opens a new window with an empty mail - how do I deactivate that?

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.

Just display « Display images Always display images Stop undo »

The only extension with perfect integration for Gmail multiple accounts.

It does what it says it does unlike many other extensions and does not impede or slow browser performance down like other extensions. Makes checking, reading and managing my 2 email accounts a breeze. LOVE IT!

Excellent!

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.

This is the perfect extension if you migrated from Google Chrome