Rated 5 out of 5 stars

Super simple and fantastic! Icon customization would be nice, sounds like it is coming, so will keep an eye out for that. For the time being, works for everything I have needed it for so far!

Thanks for your review!

The icon customization is available in version 0.4 and later (you can click on the icon to select a different image, and click on the refresh button to revert it).

This is now documented: https://support.tantely.fr/servicedesk/customer/kb/view/557096

If it's not working for you, feel free to raise a ticket via the support website.

Rated 5 out of 5 stars

Very good with a wide range of options (save/export/import/cloud), but lacking some features such as customization, user-agent settings, and icon selection, similar to ThunderSuite.

I don't know if Thunderbird and his API could use something like Firefox Containers.

This review is for a previous version of the add-on (0.3). 

Thank you for your review and feedback!

Icon selection is on the roadmap and is currently being tested. It may be released next month.

There are no plans to add user-agent settings, as this would require more permissions for the add-on.

At the moment, there doesn't seem to be an easy way to have something similar to Firefox Containers.
But I agree that it would be a great addition.
I can't promise anything, but I'll add it to the roadmap (at least to check the options).

Rated 5 out of 5 stars

Works great! I predict a great future for this "simple button". Well done!

This review is for a previous version of the add-on (0.1).