https
No, the discussion is about Firefox Send generally. The cumbersomeness discussion is a specific subthread.
And if you really think one 'https' enabled webserver software on a home subscriber cable/dsl connection is much faster then the other for a single download, then i will have to inform you that you are mistaken.
And setting up a simple webserver to exchange files isn't that hard at all. To say file sharing is cumbersome is a bit stretching the truth.