I think it'd be nice to enable the CodeEditor extension on the Schema namespace on Meta-Wiki. The namespace is housing JSON using tabs, apparently, so the CodeEditor extension would make life easier. Plus the extension could generally use some stress-testing (it's currently only deployed to the Scribunto namespace on MediaWiki.org, as far as I know).
Version: unspecified
Severity: enhancement
URL: https://meta.wikimedia.org/wiki/Meta:Babel#CodeEditor_extension_deployment_on_Schema: