TODO: Sync should catch all startup change types (the constants above) and react to them. We may need an API or some kind of verification/test to ensure newly-introduced startup changes/constants aren't missed by Sync. (This is all because getStartupChanges() requires a type as a parameter.)
The first release will not include locales & dictionaries. follow up bugs have been filed.
|Feature ux design=;May need some for giving the user feedback when an add-on is being updated due to sync.
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