Hi, thanks for the review!
Unfortunately Firefox account (now Mozilla account) allows limited storage to sync data (only 8KB), so I cannot use that sync because notes are bigger than that limit.
I'm so sorry.
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Update: in the next release (Notefox 4.0) there will be the sync via Notefox Account. Read more:
https://www.notefox.eu/help/switch-to-4-0/
https://www.notefox.eu/help/notefox-4.0/