Thanks for the excellent addon! With this, now I can watch IPTV within web browser without downloading any IPTV player, and I can use my Firefox bookmark to store and sync my collections of the IPTV m3u playlists instead of maintaining a .m3u playlist file.

Also, the author acts very quick for my feedback on github. I requested to make the subtitle font-size etc configurable, and the author implemented it and published the updated version within only a few days.