Last modified: 2010-05-15 15:38:50 UTC
With $wgMimeType = 'application/xhtml+xml' set to send browsers into strict XML parsing mode, Firefox 1.0 seems to get confused on the classic skins (tested Classic and Cologne Blue): it shows the 'This XML file does not seem to have style information associated with it' and shows a node tree. MonoBook displays correctly with this setting, so there must be some difference in the markup that triggers the different behavior. Classic seems to work fine in Safari 1.2.4, so this may be a Mozilla bug or it may be a Safari bug in showing the styles. ;)
Was a MediaWiki bug, wasn't sending the correct xmlns attribute. Fixed in HEAD and 1.4.