Salesforce to Salesforce Sync Status & Rec Detail v1.0.5
Salesforce to Salesforce Sync Status & Record Details plugin works in both Classic and Lightning:
i) Shows Salesforce to Salesforce record Sync Status and corresponding Partner Id of the shared record in the target Org
ii) Shows all Field values for the given record and it's complete Field History
iii) UUID/GUID Converter
It's also available for Chrome: https://chrome.google.com/webstore/detail/salesforce-to-salesforce/amjffmpjihnjbfpnkkdpfkbaiogbeong