Atendeu minhas necessidades , curti .

This is not working properly anymore. It rarely works when I click on the delete button.

After clicking delete, the message is not deleted. Reading and the spam button also do not work in the pop-up window.

Great

I wanted to have sound notifications for specific labels but I don't know how to add labels with special characters like spaces.
I think there should be some kind of dropdown with labels existing on my gmail.

Great Gmail notification on Firefox browser. Accurate, Handy, Configurable, Saves a lot of click work, convenient preview allowing deletion and marking without entering Gmail website, icon notification with numbered notification on toolbars

like others it's terrible to set up for the less than savvy computer users. x-notifier is the best and simplest but stopped doing google, after 3 different extensions found Notifier for Inbox which works well and simple set up. Good Luck