Everything in TEST_HARNESS_BINS gets copied straight from dist/bin to the bin/ directory for the test package: https://hg.mozilla.org/mozilla-central/annotate/5787d784485e/testing/mochitest/Makefile.in#l20 ...we should really strip those first. If we were using the mozpack code to copy files that'd probably take care of this for us. Alternately, if we were using the Python zip generator to generate the resulting zip that might also take care of it for us: https://hg.mozilla.org/mozilla-central/annotate/5787d784485e/testing/testsuite-targets.mk#l431
are we properly using symbol files for those when we get crashes?
I would guess that we don't handle crashes for most of those things at all, except xpcshell in the xpcshell harness, where we use Breakpad symbol files.