MediaWiki:Middleclick.js

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function start(){
console.log("Middleclick prevention started");
	$(document).mousedown(function(e){
		if ( window.location !== window.parent.location ) { 
			if(e.which === 2 ){
				console.log("Middleclick prevented");
				return false; // Or e.preventDefault()
			}
		}
	});
}
start();