Subtitles don't work for the most part though, so a bit of a non-starter here as I sometimes have to be quiet, and my SO has a slight hearing loss making dialog difficult to hear.
This is very much a YMMV situation. They work for me, both in the web UI, the native app, and in the Kodi plugin. I think it may have to do with where your subtitles are coming from and/or how something is configured.
If you have a device that can run it, I find that Kodi is the best frontend for JF. It has a lot of extra features that the normal client doesn't.
I have had that issue from time to time. What I did to solve that was to install plugin to extract the subtitle. Now it works perfectly (on webos tv client at least).
