Is there any chrome extensions or maybe hacks that can show to user that link already bookmarked?
Although, I am not sure about finding the duplicate bookmark on the fly but you can try Fast Bookmark Scanner - which may solve the purpose.
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Unfortunately I need it for "on the fly" purposes ) But thank you! I think I'll always open links and will check if it bookmarked already – Крайст Jun 23 '16 at 17:24