Dmitry, sync across Firefox and Chrome works perfectly fine for me. Can you file a request with more details here: https://github.com/manugarg/pagenotes-issues/issues.

Include details like:
- If there is a specific direction your sync is not working.
- By the way, sync happens at 5 min interval, unless you manually trigger it. Did you wait for up to 10 min (for both direction)?
- Is your Chrome Page Notes installation old, i.e. are you using old client by any chance.