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.

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!

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!

This is the perfect extension if you migrated from Google Chrome

Amazing extension! Fluid design, solid performance! Developer deserves full support!! Great work!

Thank yoy, it's greatest checker.

Es imprescindible para mí.

i have this for chrome but is there a version of this for yahoo once 57 is out

Just switched from Chrome and, after changing the button to open gmail in a new tab via the options, this works the same way as the extension I was used to using before.

thank, works great

The best Gmail Notifier. Period. Thank you for that.