Once bug 848560 lands, gzipped JSON will become the standard form for attaching memory reports to bugs. As a result, the "read from clipboard" function won't be much use, and we should replace it with "load from URL".
Since it's just JSON I don't think there will be any security concerns, but perhaps we should run this past a security person just to be sure.
Note to self: an XHR is the way to do this.
"Read from clipboard" was removed in bug 1127645. "Load from URL" would still be very useful.