Re: [Mediawiki-l] Extension used in WikiMedia's fundraising drive

16 Mar 2012

That would be the CentralNotice[1] extension. although, If it just a
single wiki you can just use a SiteNotice[2].

[1]. https://www.mediawiki.org/wiki/Extension:CentralNotice
[2]. https://www.mediawiki.org/wiki/Manual:Interface/Sitenotice