Recently, most of the Extensions started to get stuck while installing, checking for AMO credentials forever. Had a PC with a ton of extensions installed in the past, now I formatted it and can't install any of them again. That's just too bad. This was my favorite extension by far. Please update it, make Musixmatch work and I will start supporting this extension with donations. Won't do it now since it hasn't been updated since 2017 and don't know if the developer is still on it.