I don't think they have a way for users to fund individual features, but you can help feature development in general by donating: https://give.thunderbird.net h

I don't think they have a way for users to fund individual features, but you can help feature development in general by donating: https://give.thunderbird.net https://give.thunderbird.net Since the most recent comments indicate that they have it on the roadmap, I think that would also help the specific feature you care about.