Comment # 2 on bug 1076907 from Wolfgang Rosenauer

Not sure what your expectation is but firefox.desktop contains:
MimeType=text/html;text/xml;application/xhtml+xml;application/vnd.mozilla.xul+xml;text/mml;application/x-xpinstall;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;

So I guess that is fine?

So can you please explain what real issue you are refering to?