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 subt

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.