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by DavideNL 2581 days ago
"Currently, add-on sync leaves setting synchronization to the individual add-on. If an add-on has support for syncing settings, they will be synced. If not, they won't. For now, if an add-on doesn't preserve settings during Sync, you should contact the add-on's author and request Sync support."

https://wiki.mozilla.org/Services/Sync/Addon_Sync