UpFTP is a powerful, easy-to-use FTP client that allows developers to quickly and securely upload and download files to and from remote servers. It supports FTP, FTPS (secure FTP) and SFTP (Secure File Transfer Protocol). It also provides secure file transfer and secure file management, allowing developers to safely and reliably store and manage their files. With UpFTP, developers can easily transfer large files and manage multiple FTP connections at once. It also provides advanced features such as queued transfers, folder synchronization, connection scheduling, and more. UpFTP is available on Windows, Mac, and Linux platforms.
Bundleware The installer may contain adware. Be careful during installation: https://alternativeapp.info/discussions/applications/11718/be-careful-in-the-installation/
Discontinued The extension does not work in Firefox 57 and later versions. The developer ended support and development of FireFTP after 13 years. The extension still works in XUL-based Firefox forks such as https://alternativeapp.info/software/waterfox/ and https://alternativeapp.info/software/palemoon/.
Discontinued In March 2009, the development of BitKinex was stopped and it became freeware. The latest version, 3.2.3, can still be downloaded from the official website.
Warning Be aware that installing FileZilla on your computer might install some packages / malware on your machine. See this thread in the FileZilla forum: https://forum.filezilla-project.org/viewtopic.php?f=2&t=48441