I loved Firefox Send and really hope they can find a way to address the malware problem [1]. It was the only large file sharing service I fully trusted both because of the encrypted zero-knowledge aspect of the system and the organization behind it; I used it several times a month personally and told others about it. To me it was a "win" under the Mozilla/FF brand.
[1] https://www.zdnet.com/article/mozilla-suspends-firefox-send-...