jmm6486 Ads on Spotify is definitely hard to block completely. Even with uBlock Origin, Spotify ads can still appear (I think regardless of browser).
I've able to get it to a point where it blocks the audio but it still momentarily pauses the queue for a few seconds before playing again as it attempts to load the ads but can't.
I'm not sure if you still get ads on Chrome or not since you've uninstalled it a while ago, but I do think Spotify is still constantly upping their anti-ad-blocking game.