Salesforce Sharing Button is a productivity chrome extension. it's a free extension , it has 116 active users since released its first version, it earns an average rating of 4.00 from 1 rated user, last update is 1268 days ago.
Salesforce Sharing Button for Objects in Lightning Experience.
You could download the latest version crx file or older version files and install it.
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100% user give 4-star rating. Read reviews of salesforce sharing button
You could find more help information from salesforce sharing button support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of salesforce sharing button.
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Seems to work as described. It jumps you into the Classic Salesforce view of the Sharing page where you can select the desired sharing options. Once saved you'll have to manually go back to Lightning via the Lightning hyperlink, if desired. Easy enough work around until Salesforce comes up with an actual Share button in Lightning.