I don't understand all the negativity around this. People complained when Firefox added Pocket, in part because they took a browser extension and made it a feature that was ostensibly unrelated to web browsing. Now they're taking an old feature that's definitely not related to web browsing and removing it, and people are still complaining? Firefox can't be everything. It should focus on being a great browser and not…
Understand this: ftp has been with the browser for 25 years. Ftp has been with the web. Ftp is part of the web. No one cares that ftp is not really what browsers are made for. Browsers is how people access ftp. That’s it. And they have been used in of web pages too.
Even Apache 1 can expose dirs over http instead of ftp, there is literally no reason for FTP unless you want uploads. In which case: no you don't, you want sftp at the very least, because you care about the fact that you want data that gets uploaded to be your data, not the data that a MITM trivially changed it to. Which FTP fully allows.