Ignore content-disposition: attachment header?

[fwenzel]

"Auto-rotating the girl image on this page[1] causes a "Save As" dialog to come up.

[1]: http://support.leadtools.com/CS/forums/2431/ShowPost.aspx "

The forum software in question sends the image with content-disposition: attachment, so Firefox shows the save-as dialog when I try to rotate the image. That's not a bug in this add-on as much as it is the forum software being weird, but if we can avoid this, then we should.