Yes, apparently they no longer support RealDownloader and prefer you to switch to their new cloud service and its RealTimes Downloader add-on. Have you investigated that? https://customer.real.com/hc/en-us/articles/204040623-Using-Download-This-Video-in-Google-Chrome-Edge-and-Firefox There also are Firefox add-ons to download videos. However, if you are primarily interested in YouTube, it definitely is a "moving target" as Google changes the coding regularly. For example: https://groups.google.com/forum/#!topic/video-downloadhelper-q-and-a/pDMpDQ8B_Lk