If the systems are the same, yes. BUT if they are different (type systems, versions . . .) if may cause issues with preferences.

https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer How do I set up Sync on my computer?

The toolbar customization is stored in browser.uiCustomization.state

You would need to create sync browser.uiCustomization.state and have a corresponding services.sync.prefs.sync.* that is set to true to include this pref for syncing.

• services.sync.prefs.sync.browser.uiCustomization.state = true