It was a nice add-on that served well in the past years. However, it is no longer maintained and this add-on is causing massive lags. Unless the author provides a fix, there is a question if the add-on is still worth to be kept.

Only for major platform such as youtube, soundcloud, vimeo, dailymotion, twitch.... But not for all Html5 video !!! Forget it for platform such as crunchyroll, funimation and all other smaller platform !!