>>>> Christian Boltz <opensuse@cboltz.de> 7/18/2012 5:13 AM >>>
>Hello,
>
>@Matthew: can you please check if there's something wrong with the
>server?
>
>http://en.opensuse.org/load.php?debug=false&lang=en&modules=mediawiki.legacy.commonPrint%

>2Cshared&only=styles&skin=bentofluid&*
>is delivered gzip-compressed - but it seems the HTTP response header
>does not state that.
>
>The result is that Firefox only sees binary crap (gzip'ed CSS) instead
>of the content of MediaWiki:Common.css :-(
>(Funnily Konqueror (webkit mode) seems to auto-detect the encoding and
>can use the CSS delivered via load.php.)
>
>Note: Testing with "telnet en.opensuse.org 80" without "Accept-Encoding
>gzip, deflate" is pointless for obvious reasons ;-)

This appears to be a bug in the MW software. Please see https://bugzilla.wikimedia.org/show_bug.cgi?id=25667. I'm looking for a workaround. Apache itself should be fine, as it would be using the default compression settings.