And for the times I need to send attachments, https://send.firefox.com https://send.firefox.com or email (asynchronously), and sometimes https://instant.io http

And for the times I need to send attachments, https://send.firefox.com https://send.firefox.com or email (asynchronously), and sometimes https://instant.io https://instant.io (synchronously, for GB sized files, if the other party doesn't have a regular bittorrent client)