Never used atom, I use sublime. Also can't find any extension named sshfs. I don't want to install another FTP program and then open it up every time I want to make a change.

sshfs is a utility that allows you to mount a remote directory locally over an SSH connection.

There's also CurlFtpFS (or GVFS's FTP support) that mounts regular FTP. There really isn't a good reason a text editor should implement remote file protocols themselves. Let it be handled at a lower-level!