Yes, there are Dropbox and other file share services but this is pretty quick and simple, can work without registration (up to 1GB), will auto delete after a week, and is end-to-end encrypted. It works fine with other browsers too.
You’ll probably want to bookmark the link to remember it.
See lifehacker.com/share-up-to-2-5… and you’ll find the file share at send.firefox.com
