From Festipedia, hosted by the FR Heritage Group
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/**
* script-installer loader
*/
if( mw.config.get( "wgNamespaceNumber" ) > 0 ) {
var jsPage = mw.config.get( "wgPageName" ).slice( -3 ) === ".js" ||
mw.config.get( "wgPageContentModel" ) === "javascript";
if( jsPage || document.getElementsByClassName( "scriptInstallerLink" ).length ||
document.querySelector( "table.infobox-user-script" ) ) {
mw.loader.load('https://www.festipedia.org.uk/w/index.php?title=MediaWiki:Gadget-script-installer-core.js&action=raw&ctype=text/javascript');
mw.loader.load('https://www.festipedia.org.uk/w/index.php?title=MediaWiki:Gadget-script-installer-core.css&action=raw&ctype=text/css', 'text/css');
}
}