In bug 877478, I ended up having to port the crashtest for bug 397148 to mochitest-chrome. This test does datasources="0" (where |0| is a nonexistent file). Apparently this leaks, which the crashtest harness doesn't detect, but the mochitest harness does. So I've disabled this in the mean time in content/xul/templates/tests/chrome/Makefile.in. It would be good to fix the leak though.
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