Problematic?
This might be a problem for some users. I set FF privacy blocking to "strict" by default, which blocks (what Firefox thinks are) trackers and 3P cookies and it breaks a fair number of sites. It's OK for me cos I can decide whether to make an exception for sites but users like my mum will just be confused when sites won't load. I guess it could change sites' behaviours if they see hits declining, but I doubt it.
