Yes, good point. Gopher is internet browsing too but is Firefox the best way to experience FTP and Gopher? How many different protocols should Firefox support? Firefox does not have the same resources as Google so focusing on what Firefox is known to do best such as HTTP and its supporting protocols, like WebSocket, really well looks like a good strategy.
I just checked my Windows 10 machine and it still has the FTP command-line program built in. What proportion of machines have Firefox but no FTP command-line program (or a "finder"/"explorer" that doesn't support FTP)? I cannot imagine this number is large.
