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This patch updates the targeting for two in-tree messages that include “source == ‘startup’” in their targeting and are triggered on default browser check. There are currently edge cases where these messages can collide with about:welcome. See [[ https://bugzilla.mozilla.org/show_bug.cgi?id=1897804#c4 | this comment ]] for steps to replicate an example. By adding additional targeting that ensures this isn’t the user’s first session, we can avoid about:welcome collisions. Differential Revision: https://phabricator.services.mozilla.com/D213456