Breadcrumbs appends a short history of events to crash reports. These help to
diagnose the cause of the attached crash by providing context around when it
happened.
Breadcrumb events include:
* user-triggered actions listed in tools/metrics/actions.xml
* per-tab actions, e.g., when navigation starts/finishes
* per-browser actions, e.g., number of tabs opened/closed/moved
* memory pressure
* startup/shutdown
Breadcrumbs are not uploaded or stored on disk unless the user has consented to
metrics reporting.
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