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Can I replace all data on a browser with sync data, instead of merging it?

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I'd like to completely replace the data on new Firefox installs with the data on the server, instead of having it merge the defaults back. The old Firefox Sync used to have this option, but I can't figure out how to do it with the Firefox Accounts based system.

I'd like to be able to change preferences on my master install, and then making absolutely sure that gets pulled down on other instances.

I'd like to completely replace the data on new Firefox installs with the data on the server, instead of having it merge the defaults back. The old Firefox Sync used to have this option, but I can't figure out how to do it with the Firefox Accounts based system. I'd like to be able to change preferences on my master install, and then making absolutely sure that gets pulled down on other instances.

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Sorry, there are no user controls for replacing data via Sync. Merge is the only way Sync handles data.