Firefox having an empty check box on Blocks cross-site trackers is a lie.
Docs Enhanced Tracking Protection in Firefox for desktop
Ignoring isolation is misleading - in this marketing context a plain lie.
They could have made a differentiation between all-blocked vs some-blocked, but empty indicates none are blocked, which is a lie.
Do you need the song to tell you to get shit done? Isn't listening to that just putting it back further?
Usually I open soundcloud.com and have music from there running in the background. No specific songs I regularly or specifically for this I come back to. I do have my likes, shares, and follows though, if the feed is unfitting.