Just uploaded a new release with an important HtmlTerm fix and a pretty cool new fTelnet feature. There were also updates to Client*.js, so make sure you incorporate those changes into your versions of the file (if you don't just want to overwrite your versions and start fresh).
The cool new fTelnet feature is scrollback mode! This has been on the TODO list pretty much since the beginning, and since several people asked about it recently, I finally got around to implementing it. Hit CTRL+UP ARROW to enter scrollback mode, and then UP/DOWN or PGUP/PGDN to navigate. When you're done, hit ESC to get back to "live" mode.