Haven't seen an ad, or a website detecting I have an adblocker. The only thing I've seen is a website saying "an ad used to be here", but those might've just been placed behind the ad and not a sign of the adblocker being detected.
Youtube does sometimes detect you have an adblocker, but it's always fixed within a week. Even then, them purposely making your video load 5 seconds slower is less annoying than a 30 second ad.

Tốt

Now that Chrome came out with Manifest v3, I'm back on Firefox after a 15 year hiatus. Thanks to Raymond and the uBlock Origin team, the OG version of the extension is still going strong over here in FF land. Much love to the developers!

Best add blocker by far