I've use "Video download helper" which is a firefox extention. also has a desktop app part. Works pretty good for most things. As long as it's playing it can normally get it. Worst case scenario you play it and screen record with OBS studio. but be warned you have to set it to record a browser window if you want to be in another open browser window doing other things. Even then it will record any sound including your mic and any other thing playing on your computer.
