Rated 3 out of 5 stars

Not bad BUT if we receive any mail, we are not notified.
Protonmail ask to allow desktop notification but of course we can't.

Thanks for the feedback, this is a simple extension that opens Proton mail in a new tab as mentioned in details and notifications is related to Thunderbird browser you can find more about how to activate it here;
https://github.com/tdmrhn/Thunderbird-Quick-Access-Buttons/issues/9

Rated 5 out of 5 stars

Hey!
I'm using both the ProtonMail and Tuta quick access.

Could you please provide the source code for the addon's? Perhaps as the link to the GitHub repo.

Many thanks

Sure, you can check all here;
https://github.com/tdmrhn/Thunderbird-Quick-Access-Buttons