Thanks for the information Asojima.
FujiTV put together a really crappy and confusing website for their service, download is for Mac and Windows only (I'm on Linux), the same page mentions Android, but there is link to an Android app (EDIT: Link to the app is in the user guide, you have to download an APK. Honestly, a paid service and they can't put the app in Google Play?). The subscription page mentions Linux, but no download for a Linux client. Well, there is a web client, but wait - it is using Flash. Really Fuji, Flash? In 2018? I would be willing to pay 200$ per year, but not for a Flash-based service.