This is the meta bug about making sure that Telemetry can produce reliable symbolized crash stack on all platforms.

Exit criteria: we have tests that assert browser' crash stack is symbolized on all platforms & the tests are not flaky.

Emily's doc: https://docs.google.com/document/d/1CAHzQlCueCZUNNDiCK9HwjNWBm6wjut5012K3PTVoAQ/edit 


Hopefully Emily can take this bug when she comes back.