Shameless plug: I wrote ffsend (https://github.com/nneonneo/ffsend https://github.com/nneonneo/ffsend) to interact with the Firefox Send experiment (send.firefo

Shameless plug: I wrote ffsend (https://github.com/nneonneo/ffsend https://github.com/nneonneo/ffsend) to interact with the Firefox Send experiment (send.firefox.com). With this, you can upload a file which is end-to-end encrypted (i.e. it is uploaded encrypted, and only you have the key), and accessed via a simple URL that you can share with your receiver. FF Send files last for 24 hours, and you can configure the number of downloads allowed from 1 to 20. The maximum filesize is around 2 GiB. The reason I wrote ffsend is that the official site loads the entire file into memory in order to en/decrypt it, but my script is able to stream the en/decryption and thus significantly reduce memory usage.