Thread:Project:Support desk/Not working in 1.16.2?/reply

1.16 is end of life; we are not releasing security updates for it any longer. See Version lifecycle for details. And when you upgrade, you should consider keeping your customizations separate from core MediaWiki as MediaWiki extensions for easier maintenance.

That said, putting your code at MediaWiki:Common.js should work, provided that your customizations did not break it. Putting it at User:Bytesmiths/common.js will not work on your old version, and putting it at User:Bytesmiths/monobook.js (if you use the Monobook skin) will only work if you have  in your LocalSettings.php file.