How do you make it so that references function as popups like on Wikipedia? You used to be able to do that with just the cite extension, but they took it away.
Topic on Extension talk:Cite
if you mean enwiki when you say "like on wikipedia", it's done via gadget, namely en:MediaWiki:Gadget-ReferenceTooltips.js, which is explained in Reference Tooltips. there are some other options, specifically one lighter with less features: he:Mediawikiי:Gadget-CiteTooltip.
peace.