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
The exact circumstances of how this is showing up in the wild aren't clear - there seem to be a couple of ways we can get here. However it all revolves around early shutdowns (i.e., from the select profile popup) - before the StartupCache is ever initialized. In any case, the solution shouldn't change based on the exact circumstances - if we don't have a StartupCache, there's no need to write one. Also, don't bother lazy initializing it if it doesn't exist yet. Differential Revision: https://phabricator.services.mozilla.com/D63208 --HG-- extra : moz-landing-system : lando