[marcosdumay]

I certainly do not see it on the frequency the GP is talking about. But it's there. Every once in a while there is a site that insists on throwing you into infinite captchas, on requiring some extra information, or just refusing to work just because Firefox won't spy on me for their benefit.

I also do really not experience it "regularly", but different people visit different sites.

That said, the one problem I get most often is this Cloudfare one.