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Robert Helmer authored
FirstStartup provides an optional mechanism to run synchronous services before the UI appears. This is intended to be called as a post-install action from an installer, such as the Windows Stub Installer, to allow for downloading critical data and performance tuning before the first run of a new Firefox install. Differential Revision: https://phabricator.services.mozilla.com/D43364 --HG-- extra : moz-landing-system : lando
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