...does that mean ad blockers and such can't be far away?
AdBlock for Safari.
Note that the developer writes, "It has a few rough edges because I wrote it on 12 hours notice." (I installed it along with John Siracusa's
Safari Reload Button, but uninstalled both because one or the other (or the combination) crashed Safari, and I haven't gotten around to methodically determining which one was at fault.)
Many more extensions and associated information can be found at
Safari Extensions.