Go to Special:extensiondistributor on mediawiki.org Note the lack of popular extension list. Special:SkinDistributor works fine.

I think this is because graphite is timing out. I had luck splitting it into multiple requests. e.g. https://graphite.wikimedia.org/render?target=sortByMaxima(groupByNode(summarize(MediaWiki.extdist.extensions.[0-A]*.*.sum,%221w%22,%22sum%22,true),3,%22sum%22))&format=json&from=-1w&until=now for different initial letters.