> 2. They created an awesome private file sharing service (firefox send) and quickly butchered it.

Thankfully it was MPL licensed[0] and has an active fork[1]. The only problem is that Mozilla requested their trademarks Mozilla/Firefox be removed, so finding this fork is a bit hard on Google.

0: https://github.com/mozilla/send/blob/master/LICENSE

1: https://gitlab.com/timvisee/send