IceCat Mimetype patch

[Eric Padman]

Hello,

I've attached a patch to make IceCat to use xdg-open to open files in
the Download window. An unintentional side effect is this seems to cause
IceCat to use Gnome's notification system rather than it's own. If there
is a better way to patch this problem I'd love to know.

Thanks,
Eric Padman

mimeTypes.patch
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