Last modified: 2014-11-18 18:07:07 UTC
Debug mode breaks horribly in Internet Explorer 9: none of the CSS/JS files load, and the developer toolbar shows this message when one tries to view them: "This stylesheet cannot be viewed because its source is in a different domain than the page." IE9 in IE8 emulation mode works normally.
Might be due to lack of mime type headers:
Created attachment 8521 [details]
load.php returns wrong mime type in IE9
Data reported by IE9 developer tools which approving Tisza's comment.
It's not the content-type that is the problem. That is just a side effect of the 403 being returned from the request. This is the same problem as bug 28840
*** This bug has been marked as a duplicate of bug 28840 ***