Introducing Firefox Send!
Send lets you upload and encrypt large files (up to 1GB) to share online. When you upload a file, Send creates a link to pass along to whoever you want. Each link created by Send will expire after 1 download or 24 hours, and all sent files will be automatically deleted from the Send server.
It's like Snapchat for file sharing!
Firefox Test Pilot experiment page
Forbes: Firefox Maker's New App Makes Secure File Sharing A Breeze
Observer: Mozilla Releases a Super Useful Website for Sharing Large Files
ZDNet: Firefox's new tool lets you send self-destructing 1GB files from any browser
Ars Technica: Mozilla’s new file-transfer service isn’t perfect, but it’s drop-dead easy