More and more bug and bad behavior everytime Firefox update !! And Jason Savard is so Ridiculous, all theme feature are not free !!!! You have to pay for a dark theme or to use smaller font and icon !!! LOL WHAT A SHAME

Very high quality, customizability, easily $10 value addon for absolutely free!

simple and quick ! the best gmail add on undoubtedly !

Très pratique, beau design... :)

Thank you. Great!

It don't adjust to the overflow menu when open an email. Please fix it.

Please add customizable shortcuts for popular actions. Thank you.

Used to be amazing and technically it still is. But there's a lot of errors lately, making this extension rather useless.
It often displays this error code:

getBGObjects@moz-extension://03031ac1-379c-4acb-aa46-59e3a7d42487/js/popup.js:436:2

Hope it'll be fixes soon, used to love Checker Plus.