Topic on Extension talk:Header Footer

How can I add some lines before </head> tag, not in top of pages ? This extension just adds header in top of pages not actually before </head>. How to edit the real header?

I'm not an expert, but my guess is that you have 3 options:

1. Edit the skin
2. Use a Hook in Localsettings
3. Use JS in Mediawiki:Common.js

Have a look at the PCR GUI Inserts extension.