In bug 848615, we discovered that the console service can use an unbounded amount of memory. Fabrice changed it so that on b2g, we don't do this. But the problem persists on desktop. We disagree as to whether this is a problem on desktop (bug 848615 comment 11), but in my capacity as a MemShrink'er, I don't think it's OK to use an unbounded amount of memory for error reporting that a tiny fraction of users will ever see. We should be able to put a reasonable limit on memory usage here, and in the rare case that someone needs to view the full data, they can tweak a pref.