gecko-dev/toolkit/crashreporter/test/unit/test_override_exception_handler.js

function run_test()
{
  // Ensure that attempting to override the exception handler doesn't cause
  // us to lose our exception handler.
  do_crash(
    function() {
        CrashTestUtils.TryOverrideExceptionHandler();
    },
    function(mdump, extra) {
    },
    true);
}