Campaigns like this need more info. This page doesn't answer any basic questions.

How much money do you currently get? How much money do you need and how will you use it? Does it even go directly to Thunderbird development or will be used up by Mozilla for other projects?

Edit: I found some info here: https://www.thunderbird.net/en-US/donate/

Still, my point stands that communication around it should be super clear and available on all pages where they collect money. It shouldn't require me to search for it.