I have just switched over from Chrome to Firefox, and to my utter delight, I found out that Checker Plus is available for Firefox as well!

This extension is a must-have extension for anyone who uses Gmail to any degree. THe extension is intuitive, the layout/UI is efficient, and it is very hard to use a browser without it once you get used to it.

Of equally great import - the developed, Jason, is a thorough professional. If you have any trouble with his extension, be sure to email him or to leave your email address when you remove the extension from your browser. He WILL get back to you promptly, and he WILL fix your problem promptly.

Wow.. as many others wrote, this extension was the only reason I had to use chrome, was missing it so much in firefox. Other addons are nowhere near to this... I am so happy it is now finally available, bye bye chrome !

I gave 3 stars, because it loses connection very often for me... Sometimes it works for hours perfectly, but often when If I click on the icon to view emails, only the Refresh/Sign In window appears :

"TypeError: can't access dead object
Refresh or try signing out/in or add account"

I have to refresh manually to see the new messages, because it still shows the outdated number of unread mails.

I dont know if others have this problem too, but thank you for this addon anyway, it is still #1 on chrome :)

Very Good! It fllow me from Chrome to Firefox. I it the best in same type plugins.

一般

Very useful

My favourite mail notification extension from google chrome! So glad it's here on firefox now too.

Great addon!!

super cool

При добавления аккаунта Mozilla не отвечает идет зависание,но если зайти в настройки mozill в плагины и добавить аккаунт отуда то зависание не происходит,также Мозилла зависает когда хочешь удолить письмо.....очень сильное зависание

Easy to use, little to no technical problems. Interface is nice to look at and intuitive.

When I switched to Firefox 2 years ago this extension was the only thing I missed. I very nearly couldn't switch because this extension is so good. So glad it's here now. If you're looking for a gmail extension, look no further. All the others (and I tried EVERY one) don't come close to the ease of use found here.

if someone had a problem with the extension, it will not work as it should suggest:
1. Press the menu button New Fx Menu and then help
2. From the Help menu, select the Information for Technical Support
3. Press the Reset Firefox in the right upper corner of the page with information for technical support.

Esta misma extensión en Chrome es muy buena, de las mejores, pero en Firefox se notan las carencias del programador en este entorno porque es una extensión muy pobre.

Jason, thank you for finally jumping on the Firefox boat. I'm one of those who donated for the Chrome extension, even though I didn't really need the extra features. I was desperate to ditch Chrome but for a long time the lack of this extension on Firefox prevented me from making the switch. That's how convenient it is.

This piece of software was the only reason which prompted me to use Chrome some time ago. It's now available on Firefox which provides an even better user experience. Many thanks to the developper for thiswork and the Mozilla team for ongoing efforts necessary to facilitate the port from Chrome to Firefox. Best addon ever for me!