browse ftp file in firefox browser linux

I want to set users upload file to my server in browser. I use <input type="file" /> for upload file.

some of my users want to upload file from ftp server to my server. in windows this users can set ftp URL in address bar and select file to upload. but Linux users can't upload file from ftp with file browse.

so how can my Linux users upload files from ftp to my server with input HTML tag? or how can my Linux users access ftp from file browser? Not that my users use Firefox.