What was the source of this link OP? A monthly newsletter? Either way, they have more information on their donate page as well as a whole knowledge base set of

What was the source of this link OP? A monthly newsletter? Either way, they have more information on their donate page as well as a whole knowledge base set of pages: https://www.thunderbird.net/en-US/donate/#faq https://www.thunderbird.net/en-US/donate/#faq https://give.thunderbird.net/hc/en-us https://give.thunderbird.net/hc/en-us